You are someone who has had a great time at a casino for some years. In a poll you will give them a 9/10 or 10/10 satisfaction rating. Your reason for this rating is not just about winning or losing but also about things like user experience, game selection, ease of transactions, customer service, security, promotions, and reputation. Casinos usually have ways to thank loyal customers, like VIP programs, special bonuses for anniversaries, and exclusive game access. As a satisfied customer what can you do to show your appreciation for the casino beyond just playing?
Maybe coming back for more? Or introducing the casino to other people? Nothing more than this I guess, casinos got everything they wanted from people, they have the money to throw around for promotions, they need nothing from customers than more customers.
You can't help a casino that much, they already have their ways of getting what they want, believe me, only casinos that lacks fund go right down without been successful.
Do not expect anything from online casinos after sharing the platforms with others, they will do very well without you bringing new gamblers for the casino.