There is another possibility that I have been reluctant to mention, because I didn't want to seem like I was picking on "anyone".
There is an evaluation process at almost all casinos, except those notorious sweaty few that just backoff/bar anyone spreading even a little bit, whether they are spreading with the count or not. Everyone else has an evaluation process. Some initiated from the pit, some initiated from above.
So, it is not only possible, but likely, that some players are evaluated and the casino decides
at this time, they are not a threat and no action need be taken.