Everything depends on the amount of profits you are going to be making, how much reputable is the casino you are gambling at and the volume that takes part in this casino.
You have to find the best combination of those three in order to eliminate the chances of getting restricted or banned.
Indeed, casinos are posing restrictions in people that are winning too much - I have experienced that with bet365 when they posed me a restriction of a certain amount that I can bet during a day because I had a consecutive winning streak of a lot of money.

You agree in some policies when you sign up - this means that you are playing with their rules...