Originally Posted by Chrome Prince

It's unfortunate, it'a all automated via computer. The software online bookies use flags accounts that take advantage of all bonus type offers to the maximum benefit each time, win x amount within a timespan whether or not they are winning overall and bet in a methodical manner.

Basically they are looking solely for recreational losing punters, where their exposure for each punter is low and who continually chase until they lose 100% of their balance and then top up.
This is the profile of their bread and butter customer.
Anything else is rejected