Was the affiliate link thing documented anywhere? I can't find it anywhere as and Googling I attempt is clogged by the current news cycle about it, so it might

Was the affiliate link thing documented anywhere? I can't find it anywhere as and Googling I attempt is clogged by the current news cycle about it, so it might be buried somewhere (or it was much more obvious and people weren't paying attention; I know I wasn't) but if it wasn't it wouldn't be completely unreasonable that they might have other undocumented revenue streams