The only threat to this burgeoning community is the same old divide & collapse nonsense that separates citizens under their overlords everywhere.
I would create accounts and start calling to defederate instances which allow non-polite (or politically incorrect or otherwise offensive) communities.
We didn't just survive the trolls on reddit. We thrived amongst them. We can handle them. We can block them.
I want curatorial tools to curate my own feed. I absolutely 100% do NOT want any admins telling me what I can't read. And going to another instance is no solution if that instance is blocked.
I don't want to be on a purely polite ecosystem, or a purely right-wing-idiot ecosystem. I want access to everybody, and the tools to curate that experience.
The trolls do NOT have the power to take us down. But the admins definitely do.
Welcome to the Defediverse.
The point of decentralization is exactly that though! People don't need to be all under the same roof for things to work, this way no central authority can control what's happening.
Your food example doesn't work because in this case creating your own instance doesn't prevent you from interacting with the other instances unless you're acting in a way that makes them defederate from yours, so you can eat whatever you want as long as you don't take a shit in your neighbors plate.
Same as #1, the point of decentralization is to divide things to prevent control.
You don't understand how the fediverse works if you experience fomo for an instance because it's bigger. It doesn't matter what instance you sign up to as long as it's federated with the other ones you want to interact with and that won't be an issue unless you join an instance populated by morons and if you do you probably deserve to not have access to the whole fediverse because it shows you're not intelligent or mature enough not to associate with morons. And worst case just create a new account on another instance if you're not happy that the one you signed up to is defederated!
As I said, I feel like I'm arguing with the crypto crowd about decentralization all over again.