On reddit you could get banned from many subs for posting in a sub that its moderators didn’t like. And in the fediverse it’s exactly the same. So what’s the point? I’m here, because I hoped that it won’t be like reddit.

That's not what caused the migration of the past two weeks. What you described was a thing all the time, yet something different and special seemed to have happened, which caused me, you and many others to move right now.

That special event was a small group of people deciding for the whole platform. This cannot happen here. Instance admins can decide for their own instance, and that's it. The other instances can make other decisions and no lemmy has to change platform (but maybe instance).