I agree with you that CoinMarketCap never advertises gambling. It is usually handled for use in the use of cryptocurrencies Casino sites are different in the crypto market Making money here is much easier. Gains more exposure on social media.
I see some ad banners of some casinos on coinmarketcap.com, Sportsbet.io, Bitcasino.io. They are casinos I saw last few days. Maybe more sites are advertised and displayed on coinmarketcap.com. I don't know there will be changes in advertisement strategies and requirements on coinmarketcap.com because of impacts from Binance.