> This is because describing your invention to a web based LLM could be considered a public “disclosure” of your invention, which, (after a one year grace period goes by), could put your invention in the public domain, basically—and thereby prevent you (or anyone else) from being able to ever patent the invention.

This is simply not true. Even if it were true (and again, it's not) you could simply use zero data retention APIs.

No one at the big model companies is trawling through your chats to steal your patents. It's not only illegal and against their own terms of service, but these people have better uses of their time.