Content creators should understand the consequences of promoting illegal gambling. Such actions can result in criminal sanctions and fines, so they shouldn't solely view the profits they generate. The impact will be devastating for society and also detrimental to the state, and social media can sometimes backfire.
Blocking or deleting Facebook pages seems to be the sole responsibility of the Meta team, the government or state cannot do so directly. Meanwhile, the worst thing about illegal gambling is that they don't provide counseling services to help addicted gamblers. I believe this kind of thing often occurs in many countries, especially developing and third world countries.
If the content creators were aware that they were promoting an illegal casino, then they should bare the full responsibility of their actions. Even if they didn't know, they're still responsible to research the service or platform they're advertising, for the safety of their audience. It's still your fault, but it's way worse if you knew what you were doing.
In the meantime, Facebook promotes a ton of scam pages and doesn't even bother checking them before accepting their money. It's not the government's job to monitor scams, but Facebook/Meta should be held liable for not bothering for the safety of their users.