I do agree with you, though if any of them are reading this, I have to also validate their experience, if not their conclusions; I was shadowbanned in r/Winnipeg, my hometown and nearest city, and not because I'm an alt-right troll, I just have a somewhat argumentative tone about things I care deeply about - it came down to my tone.
I know this because the sub is absolutely run, without acknowledgement, as a left-wing, anti-Tory space. As it happens, I am a left-wing, anti-Tory person who despises the people I am currently validating, so my opinions would never have run up against the mods' echo chamber policy. I definitely said and posted a few things which were highly opinionated, though, and which I don't particularly disavow, and which might have been less than constructive in how I said it. I'm pretty sure the post had to do with me talking about flipping the bird at someone who wasn't wearing a mask. It's not an anti-mask space.
In the spirit of disclosure, and because this is starting to feel like a postmortem of the site, and so you have an idea what I was shadowbanned for, here is an example of my worst Reddit behavior (I'm the same on here as I was on there basically): after I rumbled the shadowban and left r/Winnipeg, I briefly went over to r/Manitoba, which promotes itself as the "free speech alternative" to r/Winnipeg, and it does indeed have some more conservative voices in the mix, and that's fine.
That said, our current provincial gov is Tory and hostile to public service, so our roads and everything else have been steadily deteriorating everywhere. This government is highly bolstered by our local Mennonite Bible Belt, which is more or less everything South of Winnipeg. Anyways, there was flooding last spring and the roads were not fixed in a timely fashion. The only paved road to my town washed out last spring, and they JUST got started a couple months ago replacing it.
So anyways, someone posted a newspaper article about the residents of one of these Tory-voting strongholds being out protesting the state of the highways. I was momentarily incensed at the gall of these people who created the situation and were now howling about not being able to drive their F350s to the Tim Horton's for some tasty Private Equity sludge, and so I said something along the lines of "Enjoy the world you voted for, hicks!"
For my use of "hicks" in the "free speech alternative forum" I was not shadowbanned this time, but rather, the mods apparently kicked it up the ladder and I got a three-day ban for "promoting hate". I deleted my account about two minutes after getting the notification, and that was it for me and Reddit, about a year ago.
In the case of the actual three-day ban I can't really argue with it, it's a technicality as far as I'm concerned, and selectively applied, but that's neither here nor there, I said the word, I earned the wrist slap. But that was basically the period on a sentence that I had been writing ever since realizing the shadowban was in place.
If r/Winnipeg had given me a straight three-day ban and warned me about my tone, I would have accepted the rebuke actually. But shadowbans are sneaky and malicious, in my opinion, and there is no scenario where they are not; if you have a problem with someone, you say it to their face. If you kick someone out, you call the bouncer or you do it yourself, you don't send a robot to waste potentially years of their mental energy. That's being a shit human.
I don't sit and stew about the mods who did these things, but I also won't participate in a site that allows it. That's the other reason I'm holding off on joining Lemmy for now, I would like to see if any sites take a stance on having no shadowbans. I can accept a ban quite happily, it just means this is not one of the places for me. I cannot accept misdirection of my energy and time, even once.