Correct me if I’m wrong but isn’t the sun too small to turn into a supernova? and basically will just die a boring death after swallowing all the planets in the solar system and fade into nothingness

that’s not the main concern, EEE is the main concern (Embrace, Extend, Extinguish). We’ve seen it with XMPP and I’m afraid history is about to repeat itself if we don’t do anything about it.

How do you do that? hide posts you’ve already seen

Exactly, while mainstreaming the fediverse might bring initial attention to it, in the long run it will just destroy the values that the fediverse stands for. Especially when it’s a predatorial company like Meta