One is the instances is owned by people who praise Stalin. Lemmy.world is not. And the code is open source so Lemmy is not really owned by anyone. All you have to do is switch instances.
Problem with squabbles is that it has sole ownership. Can literally turn into reddit or Digg again.
Good to know there are a bunch of alternatives though.
So go on reddit, enjoy, live your life to the fullest bro
