I also got limited years ago. You can see it once your "max bet button" disappears.
After that I can bet like 10$ on singles on basketball where I could bet an easy 1k before.

When I asked my host back then he just told me its the odds providers decision, because I won too much. Same old.
They want suckers that play casino but once you have an edge on sports they show you the door. Today I got 0.08$ weekly bonus for platinum 2 account, thank you stake.