Actually, there are more serious implications with what happened here today - like forum collusion with a particular vendor.
If the forum wants to pull for certain vendors, that's fine - it's their forum and they have every right to do so. But then they should publicly disclose it so that all members know exactly where those who own/operate the forum stand, instead of censoring the posts of members in furtherance of such a goal, as that's just really shitty no matter how you choose to look at it.