I personally like Cryptpad. It can be self hosted, but you can also make an acount elsewhere considering you don’t want the hastle of maintaining.

Overleaf can be self hosted too

I just started playing it for an hour after I read this and it’s amazing! I wouldn’t have minded paying the 5€ if it just had a demo to try it out. But luckily there is an OST I can pay for to at least give some support

I’m severely alarmed by the amount of people arguing whether or not Steam is a monopoly. You don’t need 100% of market share to have monopoly position. Pure monopolies are extremely rare and are almost always state-run companies like for public transport. No anti-monopoly legislation is written in a way to only break up firms with literally 0 competition.