The EU's Mastadon instance will average 2k daily visitors who will spend less than a minute on the site. Some of those visitors will be bots. In about a year, those numbers will go down and discussion of the site will be limited to some wonks in Brussels arguing over whether it was a success.
Mastodon / Diaspora / Matrix - each of these operates with a very different set of incentives. In theory, yes, it's nice to think of social networks in some ideal form, as an expression of a public good. Jack Dorsey seems to have that vision, you may share it and good for you if you do.
But there's a reason half of Apple's revenue comes from iPhone sales, 95% of Facebook's revenue comes from ad sales, 75% of Alphabet's revenue comes from ad sales, and 50% of Amazon's revenue comes from fees they charge companies who sell through their portal.
https://www.visualcapitalist.c...
FAANG are a highly targeted system for fostering, promoting and satisfying desires. While it's possible to think about their features in a civic-minded, pro-social manner, they constitute a network and these features represent a small part of what they do. Value extraction and disruption are the chief reason they exist, which is anything but civic. They have highly sophisticated tools to keep people on platform and that is what explains the high engagement levels and participation rates.
Decentralized networking apps have no corresponding capabilities. Another metaphor would be a Roman Soldier versus a Tank. One lacks the ability to imperil the other, no matter how well-trained and fearsome it might be. And everyone can see the problem with a tank, it's mostly an expression of oppression that takes up space and occasionally blows things up.
But no one's going to replace their tanks with Roman Soldiers. They don't serve the same purpose.