I agree in principle, but the example doesn't hold. Anthropic is only more expensive over API, and they don't train on API usage by default.

https://privacy.claude.com/en/articles/7996868-is-my-data-us...

I've found the max 200 plans to be roughly equivalent, with Claude giving slightly more usage recently, especially after the OpenAI usage slash and upsell to the 500 plan