# 久保田 雅也@Coalis (@kubotamas) on x

- id: koinon:creator:x_kubotamas
- url: https://koinonlink.com/kol/x/kubotamas
- schema_version: 1.4

## Identity
- platform: x
- handle: kubotamas
- platform_url: https://twitter.com/kubotamas
- entity_type: creator
- person_id: Cross-platform identity not resolved for this creator.

## Reach
- followers: 44114
- following: 2515
- posts_total: 12145
- posts_observed: 1
- posts_per_day: 1.922
- account_age_days: 6320
- verified: true
- size_tier: koc

## Engagement
- status: peak_post_only
- peak_post_engagement_rate: 0.00029
- best_post_interactions: 13
- measurement_source: x_post_interactions
- measurement_formula: interactions on one post — likes, or likes + reposts + replies depending on the discovery path (the two are not distinguishable in the stored data)
- comparable_pool: peak_interactions
- status_note: We have only the single best observed post, so no mean exists. peak_post_engagement_rate is an UPPER BOUND, systematically higher than an average — never compare it against an average rate.
- unit_note: engagement_rate and peak_post_engagement_rate are ratios (0-1); avg_interactions_per_post and best_post_interactions are absolute counts. Read status before reading any number: a null rate has several different causes and status says which one applies here.

## Content
- category: software
- subcategory: ai_tools
- category_confidence: 0.95
- category_source: derived_from_recent_content
- topics: オープンソースAIのコスト優位性, AIロールアップ投資事例, AIによる投資判断自動化, AIプロダクトの本番運用トレンド
- bio: Coalis GP。元WiLの創業メンバー兼パートナー。シリコンバレーの最新テックトレンドについてゆるく発信します。NPプロピッカー。日経XTech連載中。DeNA、ビットバンク社外取締役。ソロキャピタリストファンドのM2立ち上げました。調達やExitの相談気軽にDMください！https://t.co/YyeglXwOuf

## Audience (inferred)
- status: present
- description: VCs, investors, and startup founders interested in AI investing and tech trends (Japan and US focused)
- roles: general_ai
- seniority: decision_maker
- pain_points: Making investment decisions between open-source AI and commercial models, Identifying funding and exit opportunities in rapidly growing AI companies, Filtering investment insights using AI, Staying updated on the latest trends in AI rollups and agent-based businesses
- posts_analysed: 4
- confidence: 0.4

## Commercial (inferred)
- audience_buyer_fit: 0.5
- promotion_intent: 0.3
- open_to_collaboration: false
- contact: Koinon does not publish creator contact details.

## Quality signals
- authenticity_score: 56
- authenticity_basis: engagement_observed
- credibility_score: 91
- flagged_for_review: false
- koinon_bd_grade: B — measures Koinon partner-outreach fit, not creator quality
- interpretation: Signals for triage, not verdicts. A flag means the profile is worth a manual check.

## Evidence
- [x_kubotamas#c6dcf552] オープンソースが席巻している」という見方とは逆に、企業のLLM支出に占めるオープンソース比率は19%→11%へ低下 一方で、AIプロダクト企業では本番環境でオープンソース利用が急増。例えばDecagonは約90%をオープンソースモデルで運用 理由はコストではなく、速度・低遅延・細かなファインチューニング。特定用途では小型モデルを最適化した方が実用的 AI導入初期は用途が固まっていないためOpenAIやAnthropicなどの高性能なクローズドモデルが最適 やがて用途が成熟すると、蒸留・ファインチューニングした小型オープンソースモデルへ移行する方が効率的に (https://twitter.com/kubotamas/status/2074275313312579636)
- [x_kubotamas#07b29f97] AIロールアップのThrive Holdingsが20億ドル調達。SoftBank、Altimeter、D1 Capitalなどが出資 OpenAIも出資・人材提供し、AIエージェントを共同開発してる もう会計事務所を48も買ってるのか https://t.co/0vlo0jxPto
- [x_kubotamas#aa66d37c] AIはオープンソースが勝つ。理由は倫理や安全性ではなく、圧倒的な低コスト化が新しい産業を生むからと 歴史を振り返ると、革命を起こしたのは発明そのものではなく価格の急落だった - アルミニウム：高級品→安価になり航空産業が誕生 - 電力：富裕層向け→普及し家電や大量生産が発展 - コンピュータ：トランジスタ価格の低下→インターネットやスマホ産業が誕生 - 通信：国際電話の低価格化→リモートワークやクリエイター経済が誕生 オープンソースモデル（Open Weights）が競争を促し、推論コストを計算資源に近い水準まで下げることが、AI普及の鍵になる AIがほ
- [x_kubotamas#7b3b3fa8] 投資判断もAIに - 金融ニュースやレポートの中から「投資家が本当に読むべき情報」を、熟練投資家のラベルを使って学習 - モデルと専門家の判

## Provenance
Every inferred field below carries how it was produced. Facts stay facts; inferences stay inferences.

- audience.description: source_type=ai_inferred, confidence=0.4, freshness_days=76, method=llm_persona_from_recent_content
- audience.roles: source_type=ai_inferred, confidence=0.4, freshness_days=76, method=llm_persona_from_recent_content
- audience.seniority: source_type=ai_inferred, confidence=0.4, freshness_days=76, method=llm_persona_from_recent_content
- commercial.audience_buyer_fit: source_type=ai_inferred, confidence=0.6, freshness_days=108, method=llm_scorer — Relative signal within Koinon indexing, not a market-wide score.
- commercial.promotion_intent: source_type=ai_inferred, confidence=0.6, freshness_days=108, method=llm_scorer
- quality.anomaly_flags: source_type=heuristic, confidence=0.5, freshness_days=108, method=profile_snapshot_and_engagement_ratio_heuristic — Means "worth a manual check", NOT confirmed fraud. Flags can be wrong and are not a verdict about the person.
- quality.authenticity_score: source_type=heuristic, confidence=0.5, freshness_days=108, method=Profile-shape heuristic from a single snapshot (follower count, following ratio, account age, posting volume, verification), reduced for engagement red flags where post engagement was collected. Where only a follower count is available the score saturates at 58. — The input set differs by platform; do not compare this score across platforms.
- quality.koinon_bd_grade: source_type=ai_inferred, confidence=0.5, freshness_days=108, method=llm_partner_fit_classifier + fit_score >= 0.6 AND authenticity >= 60 => A; fit_score >= 0.4 AND authenticity >= 45 => B; else C. authenticity < 30 or a promotional-pattern flag => quarantine. — Koinon partner-outreach fit, not creator quality.
- reach.followers: source_type=observed, confidence=0.95, freshness_days=108, method=platform_profile

## Freshness
- profile_checked_days_ago: 108
- content_analysed_days_ago: 108
- audience_updated_days_ago: 76

## AI retrieval
- indexing_requests: 13
- user_triggered_requests: 0
- note: Being indexed in bulk is not the same as being retrieved to answer a question.

## This profile
- Claim or correct: https://koinonlink.com/claim?k=x_kubotamas
- Request removal: https://koinonlink.com/claim?k=x_kubotamas
- Terms: https://koinonlink.com/for-ai