What you are describing is just a form of “remote following”, which is merely local caching of some content from another instance. As you wrote, each @gaming is an entirely independent community, even if the moderators are the same people across multiple servers. If an instance is shut down the community is gone. If the instance decides to throttle access and start charging money users have to pay or abandon the community. In short, this is not a significantly better user experience than traditional online forums. I’d rather have real federation.