maybe you're right, but I'd be skeptical. In a non-snarky way, this shows the data sources used in models to date up to GPT 3.
https://lifearchitect.ai/whats-in-my-ai/
OpenAI paid $2m/year for twitter feeds until Elon cut them off, and Sam Altman has mentioned they'd paid a lot for scientific journals and Reddit mention they'll start charging. Given how central data quality and curation is, if these private data sources give a significant boost, it won't be available for Apache2 models.