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This still baffles me, but I guess it's good for federation?
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A community dedicated to fediverse news and discussion.
Fediverse is a portmanteau of "federation" and "universe".
Getting started on Fediverse;
It's the same as hosting your own email server. Yes it's "best practice" to host your own, but there's updates, bug workarounds, certificates, etc etc that makes it easier to use someone else's server. In the end it's a personal choice.
Like hosting your own email server, if you also copy everyone else's emails to your server for the heck of it.