This is outlined differently based on the operator. Rules may restrict bet amounts, gameplay, geographical location and a number of other factors. Violation of a rule or accepting bonus offers back to back may result in the confiscation of your winnings if the operator deems you a ‘bonus abuser’.  While it is acceptable to have rules in place to prevent legitimate abuse of offers, in the case of a rogue site, the terms are unreasonable and may even be made up along the way as a means to avoid paying the player.