It's a well-founded concern, too. Every new wave has a cacophony of people demanding it change to work exactly like Twitter so they don't have to learn anything new or change, dooming them to experience exactly what they left if they got their way.
It reminds me of how Metro Atlanta has grown. People move out a bit to get away from Atlanta traffic. Then they miss all the stuff they had in Atlanta, and start clamoring for all they miss from where they moved from. It often starts with a Target or a movie theater. Ten years on, they're complaining about Atlanta traffic again, and they move. And the cycle repeats until half of North Georgia is consumed by a web of crumbling asphalt roads dangling off packed highways.
The difference here is Mastodon, as a community, said "No. Learn a new way or buzz off." Most people buzz off, and occasionally complain about how hostile the community was to them to anyone who'll listen. Some people stick around and appreciate the different way of doing things. Repeat.