Find My and Google's device locator service exist, they're free and work without a carrier. Ik they're not that private, but you save money at least and they're more private than your carrier. /s
I mean, Mastodon is German, so they're probably moving here. The federated fork of Dorsey's Twitter is second.
It's the platform that runs all of your services in containers. This means they are separated from your system. Also what are other services that might be interesting to self host in The future?Nextcloud, the Arr stack, your future app, etc etc.
Enable Proton. And check ProtonDB before you run it.