I have brought up an RSS-to-ActivityPub server. It can convert any RSS feed into a ActivityPub actor, so that one can follow them from Mastodon, Misskey or other ActivityPub compatible platforms to receive updates of the feed.
It's still under development so please do not abuse.
https://portal.0svc.com

I have modified the code so that it should be compatible with latest version of Mastodon, Pleroma and Misskey.

Feel free to report any issues on GitHub:
https://github.com/umonaca/rss-to-activitypub

Feed Converter

@alice
Nice!, I will be doing for one for my country news
Im curious tho, isn't this too expensive to maintain?
@k2arim99
Good question. Darius stopped his service a year ago because it takes too much disk space. I am working on a rotation script to delete old feeds beyond a threshold.
CPU usage is low because it's almost send-only. The code is based on a lightweight ActivityPub server.
@alice
I think if you are strict about them being at least kinds useful to the general population, you can maintain a lean operation, cheers!