Use a custom DNS and/or hosts file. You can cut them off the grid by blocking data upload to SSP. Don't install many apps, for games that can be played offline, play them offline.
EDIT: AdGuard DNS doesn't block the 1st URL (o.isx...) in the page. 2nd URL is blocked.
Fediverse and decentralism confused me initially but then I learned I can just sign up at lemmy.world and use it normally without having to know the backend.
Which lemmy client are you using? Your reply has