Agree for self-hosted apps. However I’m also looking for a service like that one by ente.io. Here it’s more important that they continue to operate. Sure, with open-source you can self-host or find someone else, but this only works if the service is popular. Less popular open source apps disappaer when the developer gives up. The code would still available, but no one will keep it up-to-date.
I’m not against a rule banning too many reddit accounts, but how would they know? Ok, counting aliases per sender domain is a good hint without scanning content.