If you are asking how you can reduce the risk of getting your ad accounts banned – I'd recommend you to use old accounts that have already a good ad spend (warmed up accounts) and to do cloaking. From my experience, all ad accounts who are being used for casino ads are getting banned sooner or later. So it's important to have a stable source of warmed up and old ad accounts to use. Just make sure you don't lose the collected data. You can use your pixel for as many new ad accounts as you like. It is important to have a reliable infrastructure of ad accounts – If you want, I can take a look at it and give you some tips
It depends on the casino you work with. Huge casinos own a so called RMG License that allows them to advertise on Meta Platforms. But most casinos do not have that license. In that case you need to make use of Black Hat Techniques (Cloaking, having a stream of unlimited ad accounts, a safe landing page between the ad and the casino etc.) to advertise them. Every problem can be solved, if you know how