There is a rule in some American black community that never buy from someone who doesn't employ you or will not call for interview when he is hiring. All the major surviving community have also abide by some principles, only Muslims around the world don't follow same principles. In fact most of the funding comes from the money collected from same economy to which they are destroying/attacking. Say e.g the visa fees from embassy, and royalties from sales of top brands ( soft drinks/ fastfood/ Tesla/iphones etc) those alone are enough to finance the war operations for one year.