>> Sometimes adversarial comments seem to be motivated by commercial rather than technical reasons.
Do you mean like, Alice shows her project and Bob gets on and becomes adversarial to get attention for his competing project? Or are you saying that Alice creates adversarial sock puppets just to increase the comment count and visibility?
>>noduer+(OP)
Alice shows her project to Bob. Bob comes up with some mostly-unnecessary criticism of it as a way to shoehorn in a mention of his own project.