Oddly enough, if you go to Europe and you tell them about Upload/Download Caps they look at you in sort of disbelieve.
Totally wrong there as most ISP have a download cap and most of those are pathetic the average being around 10GB, many are obviously less than the average and those with higher are invariably more expensive.
Many advertise as unlimited, then they have a fair use clause for those that they say are abusing (the unlimited) bandwidth and then they lower your download speed, traffic shaping they call it. This traffic shaping also happens when there are higher numbers on-line even if you aren't breaking any limit.