Most strip casinos don't care at all about individual counters. They will cool you though if they see you wonging or other evidence of team play. But an individual? They really don't care. I've counted playing two hands and swinging my bets by a factor of 8 at the Bellagio. I might has well have been wearing a hat that said "Make Counting Great Again" I was so obvious. And the pit boss only asked if I'd like something nicer to drink than the well stuff and my host took very good care of me on the back end. Incidentally I didn't really win much, but that's not why I play. I like the dopamine hit from the risk, I like the sociality of table games, and I like having my host pay for the entire trip thanks to my play. It would make a terrible career, but for a weekend's entertainment it nets out to being a pretty good deal.
Interestingly, if the player doesn't maintain a proper betting strategy, he will have a considerable risk of ruin even in a player advantaged game. In a game with a 10% player edge, 28% of players managed to go bust[1]. Given the large number of rounds of betting for blackjack, without a good betting strategy, even players that count their way to a 2-3% edge are probably still going to make the casino money.
The downtown Casinos are much more uptight about advantage play, but I think that's because a lot of the pit bosses are old school and they just hate the idea of a player supposedly putting one over on them.
[1] https://neilhacker.files.wordpress.com/2020/02/kelly-criteri...