[PreInternet01]

Look, it's quite simple: if you want to host your own email, it's entirely feasible.

Not, 'anyone with an RasPi can do it', but definitely 'you can find someone who will host you.'

And yes, the 'powers that be' definitely conspire against this scenario, as they do with federated social media, etc. etc., but that's not a reason to give up!