Or non-profits that are willing to accept money from supporters.
The fact that we don't see this yet, and that Bluesky has accepted the amount of money they have from actors I would not want to be associated with, makes me doubt this is possible.
Even if a non-profit wanted to operate with good intentions, the expense of running an AT proto hub would eventually prove a challenge, and the non-profit would either go under or need to start looking around for money. Meanwhile people can self-host their Mastodon instance on a Raspberry Pi.
Regarding the alleged missing features of ActivityPub, I have tried and failed to understand exactly which feature is the AT proto folks so desperately wanted that they found it impossible to achieve through ActivityPub. The whole thing with having a mobile identity or whatever seems like a nothing burger to me - at the end of the day it just means that your user name is your DID number, and that web addresses can redirect towards that one. It's hardly some technological marvel that could never have been achieved on a less centralized protocol.