This is great, it's hard to believe sites can have RSS feeds but make it so difficult to find.

I suspect some sites are just running some framework than enables it and don't even realize they have one.

I have used this site in the past to find feeds: https://www.rsssearchhub.com/

In the past I was looking for a feed for https://ra.co, but could not find it, though I had seen old posts referencing a RSS feed.

I ended up emailing them and, to my delight, they let me know they still have an unsupported RSS feed here:

https://ra.co/xml/rss_news.xml

Just for feedback, this tool doesn't find the feed, though it doesn't look like a standard URL to me.