This advertisement style is prohibited by forum rules.
I don't know how many times of violation will cause an account ban, but if it is not an immediate ban after violate that rule a first time, the ban will come after some repetitions of rule violation.
The offenders will always break the rules until they get punished with a ban. It's not even ethical to promote other casinos in announcement threads of a casino. Most users get paid to shill the sites and that's the main reason why they break the rules. I believe such members should not be given any chance if they are doing that shilling to get paid.