The Fediverse has a flaw.
On principle, you have a social network that cannot technically be shutdown. That's great!
But also on practice, starting up your own instance means being that lone wolf, and shouting into the void. If you're not part of Vivaldi DOT Social, for example, and you visit my profile, and you're not yet following me, odds are not all my post show up. Now imagine that on instance, that is all alone in the void with few users.