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Lemmy resembles the old reddit experience so well that they even emulate the old reddit server performance
(self.showerthoughts)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
...so create your community on that instance. Others will still be able to access it just like you're accessing communities elsewhere.
Some instances disallow community creation. That's the only part where this argument has any merit. Otherwise which instance a community is on doesn't really matter.
Technically it doesn't matter, but I expect communities will take off better in instances better suited to it. I doubt a gaming community on lemmy.ca will become the massive gaming community. I doubt c/Toronto will take off in a UK instance. Etc.