This is the thing about alt tech - no matter how "alt" it is, so long as it is run for profit, they'll try to rebrand into something more reputable as soon as they think they are big enough. Then the discourse on the platform stagnates and new alt tech may pop up to replace it, but the disruption to communication caused by this cycle is real. That's why I am pessimistic about any "build your own internet" initiatives. The only examples of working alternative communications that I am aware of would be things that are being run for ideology first and profit second - something like the Arktos publishing house, for instance. I still have some expectations for the internet, but alternative communications in the future will probably be peer to peer rather than anything forum-like - recent innovations seem to be making video sharing very easy and simple even without support infrastructure.