The beauty of Mastodon is not only that it is free and open but that it’s federated. You can fork it without losing access to the network or your social graph. There’s no reason a hundred forks couldn’t exist.
Also, when did forking become an insult? As far as I’m concerned, it’s the biggest compliment you can pay a project. And if you fork and stay federated, you’re actually helping to strengthen the fediverse!
What you can’t do is force people to build what you want out of entitlement.