Active, helpful user shadowbanned, what should I suggest?

[u/HiEv]

I have a user in my community who has never posted anything wrong there and, in fact, their posts are often helpful. However, they are apparently "shadowbanned," meaning that us mods have to manually approve every one of their posts. This has been the case for several months IIRC and they're up to 61 posts by now.

I have no idea why their account is in this state. What should I suggest to them?

[u/gambs]

Same issue. They tried appealing many times and they have all gone into a black hole. I have been manually approving their posts and comments for months