You are obviously talking about the big offline casinos. They are paying taxes, but there's a problem. Do you really believe that online crypto casinos are paying any big gambling taxes? I don't have verified information, but I do believe that most online crypto casinos aren't paying any taxes. Maybe I'm wrong. Somebody must provide valid proof that the casinos are paying taxes.
I couldn't get any information about crypto casinos paying tax in any country. Maybe a comprehensive search might give further clarifications. But what is certain is that casinos wins are taxed in many countries. Gambling wins are generally taxed as income or capital gain tax.
Yes, gambling is a wealth re-distribution from the working class/middle class to the rich. All industries can be viewed as such wealth re-distribution systems as well. That's how capitalism works. The government helps in balancing the system by imposing higher taxes for the rich and a welfare system for the poor(the problem is the lack of effectiveness in both taxation and welfare).
Gambling as a tool of wealth distribution doesn't favour the poor. If the argument is that government uses the tax to provide basic amenities, but even the casino owners also use these social services. Now the poor lose and pay tax if they win. The casino owners benefit from business profits and basic amenities.