This is a really well written essay by @trwnh;
https://github.com/mastodon/mastodon/issues/10590
It proposes reducing the amount of spam injected into the fediverse, by making manual mod approval of new accounts the default in all fediverse server software.
I thoroughly agree. Admins woulds still be free to use open registration, but they'd have to opt-in to the potential consequences. Not stumble into them.
This was written in 2019. Is manual approval of new accounts the default yet?