What do casino owners do if you win too much money?

First most major casinos are owned by massive conglomerates, so the owner(s) probably have no clue you or any other regular customer exist.

So let’s change the question to, what will the staff at a casino do?

First: Find out if you’re cheating. Most casinos have staff members whose only job is to look for and catch cheats, and even most staff are trained in the basics.