Even if they own any casinos, they will not reveal that. I think most politicians want to keep their business information secret. Once their period end, they may face significant losses in their business when their opposition party takes over their seat. I don't think they are directly known as owners if they own any casinos. If Trump wants to have a couple of casinos, he will ask his sons to buy them instead of buying one in his name.

No matter who owns the casino. If the players do not get scammed, then everything is fine. If a casino is owned by the political leader, they are likely to use their power shut the players mouth and scam them. The casino industry is already good without politicians.