There are very, very few ISP's in the western world that offer unlimited bandwidth. When I was in the UK (Which was up until 4 months ago), all the ISP's had fair usage policies. At least our ISP's dont terminate our accounts and hand over our details to the recording industry like in the UK (Virgin Broadband) when we download a torrent.
Hell, on my iPhone, with Uncapped Internet, I got a warning after doing more than 500mb!
It is standard practice.
Uncapped is an illusion because you're capped by
1. Time - only 28-31 days in a month.
2. Line speed.
3. Other - finding dls, setting them up, changing hard drives etc.
You do get fully uncapped options - they are just not the cheapest options available. In the US and UK you can get totally uncapped options, just that they cost 2-3x the cheap uncapped price.
Rather these options should be called FLAT RATED. You pay one amount and you can DL as much as you want.