KDCa (which i'm sure is multiple people running the site, with one person being the "face" of the site) gets a cut/profit from all Nike sales through the links that they post that direct people to NDCa. I highly doubt Adidas is paying them the same profit, or even paying them at all. ADCa has such limited online stock for many of their hyped releases, it doesnt make business sense at all for them to hype adidas more over Nike. The US site probably gets a good profit from ADC because they do get good online stock to push. KDCa makes more money for hyping Nike. In fact, i'm beginning to believe that KDCa gets even more profit for shilling Racers, the site pushes those hard. Their entire play is based on online sales, they don't really hype going into traditional brick and mortar stores.
From a business perspective, they run the twitter handle quite well. They like/respond EVERY post directed at them. And the whole idea of getting people to repost/send their purchase confirmation screenshots only pushes the FOMO attitude and gets people to want to buy kicks even more.