What #Substack has #RSS feeds? This feels way too powerful! I've tested this on two types of Substack, one with a custom domain and one that is on a substack.com subdomain: Simply add /feed or /rss to the end of the URL and go to town (in my test, adding /feed to the end of a custom domain simply redirected to /rss). E.g.:
https://wheresyoured.at/rss/
https://pastsimperfect.substack.com/feed
The feeds won't include exclusive/subscriber-only content, so keep that in mind. I found the feeds with the "Get RSS Feed URL" extension on Chromium.
@Satsuma According to another response, some feed readers like Inoreader have the ability to search for the feed URL from a base URL--I assume functionality runs on similar principles as discovery extensions for browsers.