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.
Ignorance is indeed not an excuse. Influencers should know that they are public figures and alot of people trust and look up to them. They are expected to be careful of what they endorse and what they reject so they do not mislead their fans who trust their judgement. This is the responsibility that comes with their job, that is why they have only one duty which they owe their fans, which is to make thorough enquiry to be sure they are promoting genuine products and services. An influencer who blindly promotes an illegal or scam casino should not be pardoned for any reason. They have no reason for not performing due diligence by researching the casino very well.