and yet we rarely hear of gmail blocking accounts for political reasons , which happens all the time in mastodon. And, people switch to substack and newsletters to avoid being locked in twitter. I think the problem with mastodon is that instances want to be communities, while they should simply be a content-agnostic utility.
I think we need to treat social networking as part of messaging
Possibly not for "political" reasons, but it gets increasingly harder to be an independent mail operator. I've been running my own email cluster for over a decade, privately.
Some mail providers require you to contact them to get on an allowlist to even be able to deliver email at all. Others do not formally require that, but you may have to enroll in a postmaster programme in order to track your deliverability. Yet others there's no hope at all, except running after the most recent fad in spam fighting (like DKIM/DMARC/SPF etc.), only to find that even fully and correctly configured DKIM (which I don't like on my private email for many reasons) is by far no guarantee for not getting your email marked as spam (and thus, on some providers, hidden by default), even from IPs and domains which have had no spam emitted from them for many years.
So... Yeah. It's not heard of in the public media because those affected most by this don't have any leverage. The big mail service providers (MSPs) presumably have their agreements among one another to protect their business, but if you're just doing friends&family, good luck getting anything except an autoresponder when you run into troubles.
(To offset some of the criticism here, I have had very positive experiences with contacting postmasters of some large German email providers when issues happened, so there's that.)
I think we need to treat social networking as part of messaging