There were many questions, discussions, and complaints around the RSS Viewer Web Part functionality in SharePoint Online. The Web Part is available in the Web Part gallery, but it didn’t work (connections to external feeds weren’t supported). For this reason, I created my own RSS Feed Web Part, which was (as far as I can see) quite popular.
I had to test it myself immediately, and I can confirm: the built-in RSS Viewer Web Part is now working with external feeds!
Even though no further development was planned for my own Web Part, this means that I will only add additional features on request from now onwards, and ignore it otherwise.
Thanks to everyone who downloaded, installed, tested, and/or used it!