Sadly, many don't even notice full account shadowbans [1] [2].
But account-level shadowbans are sort of known to exist. What's being reported here is harder to detect. That is, the secretive removal of individual pieces of content, or reducing the reach of an account's content.
It is very interesting--and newsworthy--how difficult it is to be anonymous on the internet. Any person, place, or thing can be "doxxed" by seemingly innocuous background details.
