While this is completely understandable, I don't understand the centralized part. Sure, there are slivers of decentralization, but not to the point of BTC.
At least the Mastodon developers won't be implementing age verification, as the main Mastodon devs in Germany said they had no possible way to implement it.
You can only access your graph through a (for you) central server. ActivityPub only decentralizes the value it extracts from the users, who get to own absolutely nothing. Even if every user had an instance, their identity is effectively controlled by their domain name registrar, so at best you can be a tenant in that paradigm.
