Every time you launch HotSpot Shield, a different IP address is assigned......can't imagine BTL being able to keep up with it.
I'm reliably told that that's just what they do do. They watch for quite a while without interfering in any way, and record all IP addresses used a lot. There's usually a range of IP addresses used, and they want to determine what the range is. Once they're sure they've found a VPN they pounce. Of course, they can never guarantee that they get all IP addresses, but they get enough to make a b***dy nuisance of themselves.