Earlier quoted context omitted.
>A considerable proportion of the revenue is quite literally diverted into forces intended to cause states to fail or stagnate. Yeah you're gonna need a credible source on that claim.
It's my understanding that, at their height, IS derived much of their revenue from captured oil assets. Note that I'm specifically not making the claim that all middle eastern oil revenue is tied to some terror group, but I'm pretty sure some of it is. Please do correct me if I am wrong.
It gave them plenty of funds for sure (and only for a limited time) but saying it's a significant enough portion to the point of lending credence to the claim being discussed? I have trouble buying that without a source.