If the reason not to create a community on instance X is because instance X may someday disappear... isn't that true of all instances? No one knows what the future may hold for any instance.
Might as well pick somewhere that's present today, and if the worst case scenario happens, we can always move. I would even argue one of the greatest strengths of Fedi is that no matter what happens to any one instance, the network is still standing.
I hope it's not for a long time, I hope we can hold out longer, but eventually physical games will 100% go away. It already happened to PC a long time ago, and mobile exists as a platform that never knew physical to begin with. It's only a matter of time before that's every platform.