Either I am completely missing something, or this is something very different. Ground News is a platform compiling different media’s takes on the same news item, comparing them and highlighting potential blind spots. Morphreader looks like a fairly standard news aggregator from its description. What am I missing? Does it also do comparative reporting and is just quiet about it? Am I looking at a different app with the same name?

Since you are asking for a website: https://www.senfcall.de/en/ is a Big Blue Button instance, hosted by a German digital rights nonprofit that is very privacy-first and requires no signup.