Short answer: I wouldn't worry about size on here
Longer answer:
I know most online things are run by corporations, but things are different on here as most servers are run by volunteers and supported by members' donations.
Being a big server can make life more difficult for the person running it because their costs go up. There are plenty of servers that have been going since the beginning of Mastodon which are still small, and the people running them like it that way.


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