Having to deal with law enforcement is unlikely even if you run a normal, encrypted, TOR relay.

Exit nodes, on the other hand, will most likely get letters or even visits by law enforcement. But those are not involved at all when just running an onion service.

Opt-in means that the user needs to actively decide to use the feature, it's OFF by default. That's currently the case for atuin (happy user without sync here).

Opt-out would mean the feature would be ON by default and users would need to actively decide NOT to use it.

A pen that records everything you write and uploads it to some compute cloud sounds less interesting than the title made it sound :/

I am unlikely to every try this, but curious: Why is that, what would happen?

That being said, Donauinsel is still quite close to the center and I personally prefer the relative quietness and greenery around there to swimming in the canal.

I am also one of those Linux desktop users who bought an M2 for power management and I don't understand how people can be satisfied with the out of the box window management experience. Every other environment supports hyper + arrow to move windows into a split view, windows, gnome, kde, whatever.

Probably true, but only as long as one can continue to externalize the cost of handling the resulting e-waste to future generations or at least current-day taxpayers.