tmakks

Extremely well written title, content so-so though.

It's simple: Make the funnel full that you don't feel any pressure, anxiety or whatever because you have options. No need for some voodoo advice from OP.

Which CPU did he use? And why is there a Macbook on all drawings? How is it related to the actual silent PC?

I agree but still a good example that OP's statements are questionable.

Unpopular opinion & OT: Synchronous communication (eg. calls, video calls, real meetings) with more than two people rarely add value.

Edit: Dear Downvoters, it's ok that you downvoted as it was expected but please share why you think different and give examples what value a 2+ meeting adds

Get a lawyer or at least someone who deals (talks) with them, asap, you are in a war.

Important question: If they gave notice today would the notice period "help" with staying longer than 1 year and hence, not falling into the 1 year cliff?

All further advice depends on above question, so once we know the answer we can give proper advice.

> cross-device tracking is on very thin ice legally under the GDPR

Exactly and tracking companies such as Adjust or AppsFlyer carry on IFDA-ing/fingerprinting users. GDPR seems to be just a nice-to-have.