> With each query OpenAI and Anthropic get more context about their users.

Not unless they break their own TOS. The temptation must be very large to do so and is probably why those settings keep mysteriously shifting back to 'yes, I give all my data to you to do with as you please'.

I don't think that's what GP meant. I think the point is maybe they could build a moat by "knowing you" in a way that makes you care about using Claude rather than, say, Gemini.