I thought it was mostly oil...from 11/2015, but expect their funding to slow to a steady drip. One thing that gets me is why the Taliban are permitted to grow poppies in Afghanistan. The Taliban told the President to get out of Afghanistan. (Haven’t been able to type President for 8 loooooong years.)
They got a fair amount from oil, but they’re still rolling along. I’d bet a shiny nickel that Saudi Arabia is still bankrolling them. It doesn’t help that we keep backing these stupid “rebel groups” in Syria who turn right around and join ISIS.