I've been noticing an unusual number of spuriously dead comments from accounts in good standing for a while now. My suspicion is false positives due to holding back the AI wave yet some of the casualties really don't seem to make any sense.
Yeah, I have seen several people who are completely shadowbanned (all comments dead) without any visible reason. There seems to be no way to report this.
To be honest I don't think my account is in 100% good standing, but I can't say for certain. There's definitely some dead comments on my account that are deserved and I think there are some small limitations that are or have been placed on it (probably fairly). Mostly around flagging and vouching.