I guess they need to do some refactoring, as all the other supported platforms will do fine with hardcoded domains.

There seems to be some support for mastodon.social: https://docs.postiz.com/providers/mastodon

I have the suprise page set as start page in my browser, so i get a surprise website, when i open a browser window.

I also think, that search algorithms work fine, as long as noone is actively trying to fill your results with trash.

You can self-host libretranslate: https://libretranslate.com/