Replying to
@jerry
Kinda managed to answer my own question, but for other people interested:
You go to any account at the chosen instance, and there are user options "block/mute" etc. One of the options is to block/mute the whole instance.
The History of a Font: Bulgaria Moderna and Its 1712 Glyphs — Alphadesigner
https://alphadesigner.com/blog/history-font-bulgaria-moderna-1712-glyphs