Note by @pancakes

iceshrimp.net now has atom, json, and rss feeds like iceshrimp-js did. you can find links to feeds for users on your instance on their profile page. users with private mode enabled will not have feeds. for technical reasons i had to change the url that the feeds are at compared to -js. they are now at /users/{id}/feed.{atom,json,rss}. feed readers should be able to discover users' feeds by providing their regular profile URL instead (tested with freshrss)