I map a publicly-investable pure-play AI data surface that's razor thin: strip out incumbents keeping data for themselves and the only US-listed sells-into-the-boom company of size is Innodata. The social-media corpus owner's licensing line is ~5-6% of revenue; the expert-evaluation layer — Scale, Surge, Mercor — remains private. The sharper signal: top-tier names win by refusing to supply, restricting training use, monetizing via live permissioned access, and deploying their own AI. By their disclosures they're deployers, not suppliers.