@linux What you want is called Nomadic Identity. It exists for some federated platforms, like Hubzilla, but overall the concept is fairly new within the federated social space. Only recently have other platforms begun to consider implementing it.
It's one of those things that are just very big to implement because it has a lot of moving pieces.
I mean, if you lose your email account all the people who have your old email account wont automatically get your new one, right?
Not using it as an excuse, but like, if they really like you they'll find you. And if you import who you follow at least you're a good bit on the way again.
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