It’s not absurd at all. They know the IPs, they know those devices use the same network, and they also know where they are located pretty accurately: the Google Street View cars also scan for WiFi networks and map them to their location.

2 devices consistently connected to the same router, to the same network, in the same place… must belong to the same person or to 2 people sharing a home. If cookies set by other websites and seen by Google show similar browsing habits, it’s probably the same person.

You just mentioned 2 different Google accounts: if your devices are connected to Google accounts they are already getting a lot of information from you that way, and Google knows that those 2 accounts are related.

I guess this isn’t what you want to hear… but like others here I’d recommend you organise and tag your music properly. Then software like Jellyfin or Navidrome should work properly.

I use MusicBrainz Picard and have seen people recommend https://beets.io/, which I still haven’t looked into.

Librewolf + uBlock Origin on desktop. Mull + uBlock Origin on mobile.

Simple games don’t need internet access. Can’t you block network connection for that app?

A better option even is getting something like what BurnedOliveTree@lemmy.world suggested, or this other one https://f-droid.org/packages/org.moire.opensudoku/ or this other one https://f-droid.org/packages/org.secuso.privacyfriendlysudoku/