If the descentralization of social networks continue, we will have to prepare for the eventual rise of the instances wars, where people will start to fight about which instance is better and which one is weird to be in and so on, but that’s for the future of us all.
The difference between the Agora and reddit was that you could be banned from reddit without any major violation.
I’m sure rights were relatively constricted in ancient Greece but nothing like what we find in privately-owned cyberspace.
And reddit is still there, for those who want the Agora. I personally was banned from reddit so I’m very happy to come to a place where it’s harder to ban me just because I don’t conform.
Until someone is willing to build a centralized place that is devoted to free speech, siloing is the price to pay for the architectural decisions necessary to permit all voices to participate.