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The tournament is probably one of the most successful marketing for a casino, I have no real data for that haha, just a guess. It is fun, engaging, and most of the time profitable for the players. It could be free to play or you need to wager, get on the top, or do the quest before anyone does. It is good to have an announcement thread so that their community can grow. It also helps them with their sales, marketing, and the quality of their support.
Free spin is a great trick to attract gamblers. Because it forces gamblers to gamble. By getting free spins gamblers come to gamble for free and while playing for free they get addicted and they then deposit money and start gambling there. But weekly bonuses, rank up, Vip, etc. are also a good strategy to attract gamblers to gambling sites. All gamblers want to get better facilities and get more bonuses so I think weekly bonus will be the best strategy as gamblers don't have to wait long to get bonus and they will be more happy.