It really happened but I believed we can't considered that as a usual scenario in land based casinos.

In fact, these casinos like big rollers and gambling whales as they are the who are giving more revenue to the casino. Even one of these whales was able to grab a big winning, expect that the other whales are losing too.

Not unless a gambler is really a GodFather of luck and grabbing crazy big winning regularly with only few losses in the process, it might trigger the alarm of that casino to do something with that gambler.