There is a solution, but don't use it, use mastodon:
In the settings, enable Firefox containers. This allows you to seperate the cookies of X from all other sites. Also install uBlockOrigin to block all trackers on X itself.
For Linux, there is Gnome Boxes, which is a quite good VM for all the stuff I need one for. It may not be as complete as VMware, but has most of the important stuff.
The closed source platform Discord may not be the best place for an open source community, but this is probably a whole different discussion. https://matrix.org/
It true that there is a new contract between EU and USA to allow accessing and storing data of EU-citizens in/from the USA. But that contract will probably be declared illegal by a court, just like the last times.
In the settings, enable Firefox containers. This allows you to seperate the cookies of X from all other sites. Also install uBlockOrigin to block all trackers on X itself.