"That's too far! I'm going to pay more for the slower/hotter part with worse support!"
totally /s
Whose to say that AMD even deserves ROG branding given their product history?
Well the subject seems to suddenly be whether AMD will even be sold under the Asus brand not just the ROG sub-brand, however it seems ridiculous to suggest that the 1050 deserves the ROG branding while a 580 or Vega doesn't.
As to whether this an antitrust issue or not I think the biggest problem is that they're not trying to get the other companies to market their products better or in a certain matter as much as they're coercing them to not promote the competition in a normal manner. Nvidia might very well get away with it which I'm sure they're banking on but I think if they do it's because the FTC doesn't really seem interested in enforcing antitrust rules and the other companies involved might be concerned about repercussions if they try to sue over it.