Because they are selective scammers. They didn't harm every user, but only a few percent, so they still have a solid base of satisfied customers. Plus if you remember their signature campaign, there was a large number of those who wanted to participate, regardless of whether they knew it was a scam casino. Imagine how many promoters, and influencers are not interested in their reputation if they pay well for promotion.
For example, I know about a satirical account on Twitter, Trollfootball, they have really funny tweets and a large follower base, but I also saw 1xbet sponsorship on their line.