I also stopped by MGM casino for lunch and a charge. There was actually a security guard parked in front of the ICE cars and writing notices to put on them all. After a short chat, I found out the current policy is to leave a note on a car telling not to park there but keep a record of the plate. Repeat offenders get towed.
I'm glad they're doing something about the ICE cars blocking the charging stations at MGM. I'm going to write another email to them thanking them for stepping up their efforts, but suggesting that they also paint the floor of the EV charging stalls green to make them more defined.