motherfuckingrssreader.com
I like following blogs and tech/science news, but I never found a simple RSS reader. So, I created my own.
Source code: https://github.com/Roald87/motherfucking-rss-reader
Your form breaks when I try to add 2 links.
User test: https://www.loom.com/share/b41908bfd6ae41b48c8371aafb58f499
I tried your two [1] feeds and it worked for me. Not sure why it didn't work for you, I don't see anything in the logs about a failed request.
[1]: https://motherfuckingrssreader.com/?rss=https%3A%2F%2Fbrecky...
one idea: instead of multiple text inputs, do 1 textarea and just put a placeholder "one rss feed per line". then people could copy/paste a whole bunch of feeds, and your form would be significantly simpler!