I don't believe it. Even if it's true, it doesn't have a positive impact on Indonesia. You can easily bypass it by using a VPN or Google DNS.
Yeah, sure, but then again, they are risking getting arrested if they gamble online since gambling is prohibited in the country.
If they are serious about banning gambling, they should also take action against people who promote online gambling on social media. I still see many influencers and gambling ads online, yet enforcement seems limited.
Are you talking about influencers inside Indonesia? If you are, maybe report them, but if not, the Indonesian government can't really do anything about it, apart from blocking or removing the ads that can be seen in their country.