In the real world, your life depends on being accepted into that group or migrating to another place while having huge losses and problems due to it later on.

Just because the punishment isn’t as strong doesn’t mean that the system functions differently. You are also going to run into issues where established communities may have issues moving.

I’m not sure i agree because an admin can also be protested against and they can share ownership

But that isn’t baked into Lemmy. That is a decision you made outside of Lemmy. Even then, is there a case where your instance could run without you? If not, you are still acting as an enlightened dictator.