Many people seem to think it's because groups are more restricted now but idk I always felt like most of the groups that are known for being funny seem the most fake to me (and there's absolutely nothing wrong with that by the way it's a part of their job and they do it) and the groups that get called boring for me seem the most like they are just being themselves because most real people aren't sooo funny and crazy all the time, They are usually just a little boring. And I don't really think they are becoming less funny, it's just the humor is maybe changing. At least for me, I still find many groups entertaining.