Bonuses and contests can indeed be a powerful way to attract the attention of gamblers, but not all casinos that provide bonuses or contests can be successful because casinos are also a determinant of success such as bonuses and contests if the one holding it is a small casino that does not have a high reputation or trust then it is unlikely that many gamblers will be interested.
So it all depends on where the bonus provider and the contest are held.
For a moment, my friend has a different assumption from yours. Will the casino forever give hope to gamblers to have more chances of winning?
As time goes by, other casinos will appear that are more attractive and gamblers will only be given a statement of hope that they have a big chance to win, but in reality it is difficult to win, so it is possible that gamblers can move to another casino for their bets.
This was before but now it has changed. What attracts gamblers to play on a crypto casino nowadays is if they don't have a KYC and also if the casino is verified to be reputable because the number of scammers right now are massive.
If a gambler focus only on the bonus, their winning will still be useless in case they get lucky to pass the requirement. They will be having a hard time of withdrawing it due to the KYC regulation and also if the site is scam. Casino never promise to give more chances of winning to the gamblers. Doing so will only make the players disappointed if they can't win but if the casino made that possible, their business won't last long.