You can store a private key at long distances. You just can’t actively participate in the network when that far away. And you can use custodians for transactions in the meantime, like a checking acc...
As long as all the hashpower is in one place it’s fine, you just wait longer to see the conformations. You can use a local lightning network on the same chain fine. It’s when the hashpower gets distributed that things start to fall apart.
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