It sure sounds to me like brokerage houses do read and take actions that are based on these messages.
TD Ameritrade hasn't taken any action against me, possibly because their detective unit hasn't been able to find out my real name. That means they can't "punish me" for going public with my concerns. Ballot123 didn't say what his forum was for his own concerns. That may have made the big difference between how he was treated by his brokerage and how TDA is treating me.