Noo

Name, address, GPS localisation data, habits (like apps you often use, moments you use one device or another), gender, search terms in search engines, open web pages on a web browser, connection (other person you know), the work you do and where you work.

All kinds of things, really.

The usage is mostly advertising or identity theft.

Maybe this: https://tournesol.app/ could be of some help ?

I think it’s in Debian main repository so it should be fine :)

It won’t appears in many research because it’s a libre software. And libre softwares get almost no press coverage from medias, so no good SEO for search engines.

Gcompris : https://gcompris.net/index-en.html

Just play games you like, you can play most multiplayer games with randoms without chatting or talking. You will probably miss some fun, but it’s not a big deal I assure you.

Just play the game you want to play, you’re not the only one who does it without talking online (like me).

Indeed, that’s why I talked about Yunohost. Nextcloud install is just one click button on Yunohost.

Archive.org if you are looking for a public place.

If you are looking for private use, I would recommend taking a small/old PC and run Yunohost with Nextcloud.

Also all depend on the stuff you’re talking about…

Son you didn’t have class manuals?