I only see hopium that everything will just work because good enthusiasts would implement best client software once for free that doesn’t require operational costs and design the network in the way that it only requires couple of thousands of very cheap relays (5-100$ a month) to  operate relays which were already implanted. And in this way relay operational costs would be cover by the same enthusiasts running tor relays or lightning nodes

I don’t think its viable and I can’t imagine any system in social network (in terms of what a regular user expects from the term “social network” today) that doesn’t mostly exist off of ads

Do you expect every regular non technical user to pay some fee for using a social network? Like twitter is trying to achieve and fails?