...Is it fiat payment methods? Is it that casinos holding users money? — these two are top of my head, you tell me more.
So, why not remove whatever those things are that makes casinos necessary to be regulated? Meaning — stick to crypto deposits, don't hold users funds (i.e, become non-custodial).
Does that get rid of casinos requiring to be regulated am I being ignorant about scheme of things?
Choose a casino where there's no withdrawal limit, so after your gambling session, you can withdraw your money and dont let your money sleep in the casino's wallet. Who else is holding the user's money in the casino?

Regulations can benefit both users and the casino.
Casinos can be targets of money laundering and other illegal financial activities, so this regulation helps detect and prevent organized crime infiltration and also ensures proper record-keeping and transparency.
On the user's side, it could be that this regulation ensures fair play, so players can trust that games are not rigged against them.
if in case the casino still does something unlawful or unjust you can easily report them because they will be under the jurisdiction if they are registered and they can be easily caught compared to if the casino wasn’t registered the government will have a hard time just trying to locate them alone.