you will always find competitions or contests in any casino, but it is hard to find peace with yourself. those contests will always find aggressive players but it is on you how you will control your gambling habits. because at the end of the day, you are the only one looking after yourself, no one will.
Because with contest, you will have to bet more, if it is waggering contest. Joining contests or not, gamblers have to gamble responsibly if they want to control their gambling style.
we have seen that duelbits are very active in introducing contests, this is why they can truly attract regular players here. they have good marketing people and know how to sustain these players. they may really survive long in this competitive industry.
One of best things with Duelbits contest is, they allow to bet with small value. I could be wrong but I think their main aim is attracting new users to their casino, and not try to steal money from failed bets in their contests.
If they want to force gamblers to bet more, and get more money from gamblers, they would require high value of bet to be eligible in their contests.