I don't know why these admins want their servers to grow so big. Just close registrations and encourage people to run servers. It doesn't even have to be all self hosting, running a server capable of supporting 100 or so people is pretty cheap, especially if you use something other than mastodon.
Are there any paid Mastodon hosting services out there? They take care of system upgrades, security, downtime, etc., while I give them a few bucks a month for some amount of users up to a given cap.
