I’ve seen reddit accounts who regularly posted comments for months all at +1 vote and never received any response or reply at all because nobody had ever seen their comments. They got hit with some automod shadowban they were yelling into the void, likely wondering why nobody ever felt they deserved to be heard.
I find this unsettling and unethical. I think people have a right to be heard and deceiving people like this feels wrong.
There are other methods to deal with spam that aren’t potentially harmful.
There’s also an entirely different discussion about shadowbans being a way to silence specific forms of speech. Today it may be crazies or hateful speech, but it can easily be any subversive speech should the administration change.
I agree with other commenter, it probably shouldn’t be allowed.