So if any server admin types are interested, it should be pretty easy* to run an instance of my RSS to ActivityPub converter as a nice bonus for your users. It lets people with a login on your Mastodon or Hometown server create ActivityPub accounts that are mirrors of RSS feeds (process pictured in attachments). ONLY people with a login to your server can use it, because you don't want to moderate this service for randos
https://github.com/dariusk/rss-to-activitypub
*easy for linux server administration, huge lmao
Note that feeds created here can be followed by anyone on any server, but the people who can make new feeds are limited to your users who have already agreed to your terms of service, and who you can suspend etc if they use this RSS mirror thing poorly.
I tried running a public version of this and it was overwhelmed by spammers and also I had to keep track of like... taking down harassment-focused RSS feeds etc. Easier to just limit it to people I trust.