I moved my custom domain from google workspace to fastmail a few years ago and didn't look back. Very happy with that decision.

The only two downsides:

1. A few people have reported my emails from fastmail (calendar invites mostly) going to their spam folder. Not enough reports so I'm not worried.

2. Google won't let me sign in and create / edit /comment in google docs with my custom email hosted at fastmail so I have to have a [email protected] account just to use free google docs to collaborate with people who only send me google docs.

Overall I think AI features are going to be great but give me the ability to pick and choose which I enable / disable and we should be good. If not then I agree with OP - Bye Bye Gmail.

oh, and don't read my emails and protect my privacy google! - no? Ok bye bye!