Just to be clear, you’re speculating, right? They could also not be doing this.
If anyone, anywhere, would be doing this, it would be Anthropic and OpenAI. That doesn't mean they are, but that, to me, certainly pushes it past simple speculation.
Edit: From your other comments, you seem to be heavily insinuating that you do in fact have inside information. If you do have such information, it's not clear to me what consequences you think you are avoiding by adding this flimsy veneer of supposed deniability.