There’s always a pros and cons to this. Surely social media has a lot of reach for new customers but there’s also a lot of bot too that fake stats for promotion. Social media can burn a lot of money for marketing due to the bots faking stats.
Many social media account of other popular brand sometimes have a lot of followers yet has a very low interaction or impression. This why sometimes forum is much better on social media since there’s no bot user here that will offer fake interactions.
Its important for them to verify the winners to know if they have legitimate followers or friends listed on their account so they would know if those accounts is just a bot and disqualify them instantly. For sure with that they will not lose some huge amount in their promotions since they can avoid those people to take advantage on their promotion and use bot to increase their chances of winning.
That really exist on social media that's why sometimes its not good to promote their especially if they don't know on how to verify the legitimate users since they can't really receive the best result since all of they get are fake people with no engagement happens. For sure they know that that's the reason why most of crypto casino choose to promote their businesses in this forum since they know that they can get those legitimate users and not those bot or fake accounts.