GLP is not some triumphal cosmic bastion of unlimited and anarchic 'free speech'.

GLP is a private, 'for profit' business.

The owner makes the rules here, much like the owner of a restaraunt determines what kind of behaviour he will allow in his business.

Just like a restaraunt owner doesn't want some scumbag to come in and start shouting about this, that, or the other for sale, the management here does not want commercial spam.