Just making stuff up based on a bit of knowledge and assumptions.
Amp pages get fed to news aggregators. That's the lightweight version. Direct access heavyweight pages don't.
Amped pages count as advertising? Regular ones are access costs plus whatever they managed to sell on them? So regular pages cost them more to distribute.
You probably have read far more Rolling Stone articles than I have which in turn has triggered them to block you. But not on the amp pages because that particular feed either doesn't care how much it costs or there's a lower restrictive weight value assigned to them when it is looked up and therefore they let you get the amp but not the regular.
Amp pages get fed to news aggregators. That's the lightweight version. Direct access heavyweight pages don't.
Amped pages count as advertising? Regular ones are access costs plus whatever they managed to sell on them? So regular pages cost them more to distribute.
You probably have read far more Rolling Stone articles than I have which in turn has triggered them to block you. But not on the amp pages because that particular feed either doesn't care how much it costs or there's a lower restrictive weight value assigned to them when it is looked up and therefore they let you get the amp but not the regular.