> I've uninstalled Copilot and disabled AI in all local applications

Depending on which vendors you trust, they will enable AI features on your local machine later on anyway.

> Switching to Linux, BSD or another open source operating system is the only real solution to this problem.

I hope this is right, and I'd argue it is not enough. You also need trustable vendors for your web-browser and web-based apps.

Agreed, I've done the same. Unfortunately Linux sometimes isn't a solution if the vendors we trust cross a line. Like recently when Google Chrome started adding its own local 4GB AI installation which caused an uproar.

If you're concerned about this, as a defense-in-depth measure you should also avoid using AI inside of browser tabs containing sensitive information. i.e. typing a prompt into Gemini inside your gmail tab could potentially exfiltrate data from your mail since your mail is accessible to any JS running inside that tab (or accessible to Gemini most likely, for that matter).