Should this have been a sled moderated thread where such users gets there off topic posts deleted quite often, I think the user would be mindful of what they post in such thread as, it’s most likely going to be deleted
I don't think it is such a good idea to make anmouncement threads self moderated, if the op deletes posts from some members, they may start accusing the casino of censoring people who have complaints. The troll in this case does not have any genuine complaints and we have seen many like them in different announcement topics, and they tend to go away when they are ignored, easy fix.
I would also like to agree with your opinion. Since the casinos here are providing their services, so their self-moderation in the ANN thread indicates that they want to suppress their complaints. And I also think that most of the experienced also don't like these kinds of ANN thread where they were self-moderated. I also personally think that casinos can improve their service from criticisms and complaints if they really have that kind of honest intention.
And what remains is fake complaints and stupid assumptions. Our community is very active in these matters. If someone is caught making such fake complaints, most of them get a negative tag on their profile.