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TL:DR; ml is for Marxist-Leninist, but each server has their own philosophy and rules, so just comment and post on other servers if you want nothing to do with this. On censorship, modlogs are public so there's no hiding stupid admin actions unlike Reddit.
Hello and welcome to Lemmy! Enjoy your stay, even if it can be a little chaotic the discussion and vibes are generally in a good place for real people to talk, and I think the Fediverse is where the future of our internet should be, open and people-first instead of corporations.
To give you context, the lead developers of Lemmy and maintainers of the lemmy.ml, are Marxist-Leninists, and that's why it's .ml and that's related to the signup process. Esoteric signup processes (most other servers are just describe why you want to join) are there to help prove you're not a bot or troll or are aligned with that server's values. Lemmy.ml is a general topic instance but their moderation has a pro-Russian, pro-China slant, and have been known to ban comments and users speaking against that on controversial (e.g. Ukraine, Gaza, US politics) threads. That's the reality, there is a lot of valid criticism of that from within and outside Lemmy, but that's also their perogative. (That sounds not great, but stay with me here.)
However, being part of the Fediverse, this software extends beyond the developers' own political whims. So, you aren't subject to their philosophy if you don't post on .ml and aren't registered with them. Other servers have different policies, some more laissez-faire like db0 or ee, some very protective like beehaw.
I hope you can understand that even if admins sometimes have power trips, they don't have the power of Spez to kick you off the whole platform or enforce awful rules. If we compare Reddit to a kingdom where you can be expelled at any moderator or admins whim, Lemmy is more like a fiefdom where you can only be expelled from the duchy. If you're an extremely unlikable troll, every server will reject you.
Because these relationships between servers are organic, it's not all sunshine and rainbows and there are a lot of topics people can and will disagree on. Please just try to be reasonable with your fellow user and moderator, try not to get upset if your post is removed (double check the rules of the community AND server you post to) if you get 20 downvotes on something unpopular (though it's avoided on lemm.ee since downvotes are disabled). Modlogs are open so if you think a ban/removal is unfair/unjust, appeal to your mods/admins first, if you think it's still unreasonable or part of a power trip rampage you can have a discussion about it on !yepowertrippinbastards@lemmy.dbzer0.com, !fediverselore@lemmy.ca, !modabuse@lemmy.sdf.org, and mention your old user handle for people to judge whether it was justified or not. Unpopular stuff often doesn't get censored unless it breaks rules, or is just plain mean, trolling, flaming or unproductive.