Mozilla is certainly paddling upstream. Of all of the AI-integrated apps and sites that I'm subjected to, I can think of exactly two where it wasn't obnoxious and a pain in the neck to disable.
I've been toying with that for ages on and off. Finally now a paid up user due to the fact that their guesswork engine (or makey-upy machine, or your preferred name) can be easily turned off, and stays off until requested otherwise.
Kagi. Zed. That's it, that's the list.