The NYT has an article that the Taliban's financial resources have been diversifying. Most interestingly, their number one source of money is no longer drug-related (though that is still important) but stems from donations.
The C.I.A. recently estimated in a classified report that Taliban leaders and their associates had received $106 million in the past year from donors outside Afghanistan (...). Private citizens from Saudi Arabia, Pakistan, Iran and some Persian Gulf nations are the largest individual contributors (...) there is no evidence so far that the governments of Saudi Arabia, the United Arab Emirates or other Persian Gulf states are providing direct aid to the Afghan insurgency.
Back in the days when states were the main actors in international politics and security matters, it was impossible to run a guerrilla war without some outside state backing it. The Soviets would never haven been defeated in Afghanistan without the CIA financing and equipping the mujahedeen. This seems no longer to the case. While this is not directly related to the ability to pool small resources for major projects characteristic of many internet-based organizations, it seems in line with a general trend that it becomes more easy to aggregate the resource of large, loosely organized networks.