I must say, there is some weird feeling in knowing that great minds are naive enough to believe OpenAI wouldnt use their chats in any way. If you give a company information it will be used, regardless of laws or promises.

There is no prove in a world the AI companies would give to you ensuring that they didnt train or use the chats.

Why would you need to train a model on certain specific near prove chat if you just query it?

Besides that, its hard to believe that its the case for every "company stole my prove".