If you win too many bets, your account will be locked and odds provider will do an investigation which can take years and decades with NO ETA.
As LoyceV also said, sports betting should be avoided for such reasons. I would say especially at stake because no other website has ever done this. Stake is freezing accounts' total balance for 1 or 2 games they believe are rigged.
You can't prove that, and that's a problem. I'd say this should be a reason not to engage in sports betting at all.