Not provable. If you have a choice between a company that does not say it's private and a company that at least does a pinky promise, and if privacy of your inference is important, then I would give it a try. If you want to be fully private, run ollama on Apple Silicon. BTW I have Venice lifetime accounts if you don't care about logging in somewhat inconveniently or want to use the API (but we don't know if that will be free for pro users after beta). https://hackyourself.io/product/venice-lifetime-pro-account/