Nothing is stopping you from expressing yourself however you want - just elsewhere, if you can't follow the rules.
fwiw, this very website has its own code of conduct: https://news.ycombinator.com/newsguidelines.html
It focuses on different things than the Wikimedia one, but it's fundamentally the same thing. For both of them, I'd suggest that if there are things that you feel are detrimental, you specifically address them.
Making an empty comment like "new wave of censorship" achieves nothing except saying "I don't like the rules". In which case, fine, there are plenty of other places on the Internet.
No, they're essentially just a list of vague rules that are at the sweet spot of "vague enough that I can make anything you write fit into it" and "vague enough that you can't point to it and definitely say that somebody else does it to you". It's basically a very rough outline of laws, with everything in between to be filled out by a judge on a case by case basis, without precedents or abstraction.
They are an instrument to strengthen the power of whoever is enforcing those rules. There was a fun read some time ago where Chinese princelings were showing off their riches, dollar bundles, rolexes, cars etc, one-upping each other. The person who won just posted a badge of attendance at a conference of the party's committee tasked with enforcing the party's moral standards (or something similar, Google is shit, I can't find it again). That's power, not being an editor with a thousand articles.