Doesn't Supermoderators can hijack and own user's sub, too?

No. Admins aren't supermoderators, they're reddit employees, and the only way you can gain control of a subreddit if you're not an admin is by /r/redditrequest, which has very specific criteria. (Moderator has to have been offline from reddit for N days, so forth.) Even admins can't take control of subreddits arbitrarily. If they did, there are a few that would have been gone years ago.

Yep, make your own sub!

And then they shut it down, take it over, give it to other people, or quarantine it if they don’t like what you are saying.

The comparison to TikTok which is popular despite being Chinese run and Reddit which is acting in a way that makes me wonder if they are Chinese run is curious.

I wonder which service really has less free speech atm.

Well, you've just pointed out the problem with centralized social media platforms. Someone else owns them.

Yes, but, if you aren’t breaking rules and they claim to be defenders of free speech you could at least expect them to play the part. I’ve seen some real shananagans at Reddit including the CEO stealth editing posts.

Reddit acting as publisher is fine with me, they just still insist they are a neutral platform.

Lol. Huffman replacing his name with t_d mod names was a troll (a great one). It was isolated, not an example of a frequent occurrence. If you're upset that he was functionally able to do that, I'll refer you to my preceding comment.

I’m not involved in any of the Reddit communities... but... I can see past my own nose on this. It’s seems many people can’t.