There is a real ethical peril here. You've just created a massive externalities-- the honest poster wasting their time without realizing it, hoping someone not

There is a real ethical peril here. You've just created a massive externalities-- the honest poster wasting their time without realizing it, hoping someone notices and tells them, and then having to take it up with you. Shadown banning is an act of fraud against the user, with the hope that it's mostly against malicious already-banned users and that false positives will get it undone. But since the cost of shadow banning is on the users and the benefit is on you, there isn't a particular incentive to not miscalibrate and cause a lot of damage to users. The only backstop is that if you're very far into the false positive domain it'll kill your venue but because shadowbanning is invisible by its nature it requires a truly massive amount of false positives to have that effect. There are also secondary damages that good users worry that they've been silenced and don't comment. E.g. after my last several submissions to HN received no comments I suspected I might be subject to some kind of shadow ban (since HN engages in that sort of thing) and stopped submitting.