Businesses seek out and use 3rd party software, whether it be proprietary or open source, because they have a need for it e.g. it solves a real world problem th

Businesses seek out and use 3rd party software, whether it be proprietary or open source, because they have a need for it e.g. it solves a real world problem they have. The whole point of dual licensing is so businesses pay cash for a closed source license because they won't or can't abide by the GPL. The exchange of money for a closed-source software license is no different than the same business purchasing a license to proprietary software. At least with duel licensing they _could_ theoretically choose the copyleft license, but in practice they won't or can't.