I'm a newbie as well, so take this with a grain of salt.
Lemmy is a language. Different "reddits" (called instances from this point on) can talk to any other instance that the moderation team hasn't banned. Every instance has their own rules, settings and moderation teams. Every instance can make "subreddits" (sublemmies). You can contribute to any sublemmy on any instance as long as they haven't banned your instance or your user.
What this means in practice is that if you don't like the moderators, go make your own instance or find one with like-minded people. If the moderators of an instance are not happy with the contributions of another instance as a whole, they can ban that. Assuming they're talking to (federated with) another instance, it's seamless and you can comment and post with all those people too.