http://uhden.i2p/articles/gpl.html
For example, in the development of the Linux kernel, the license
forces any linked component to be subject to the same restrictions,
which compels developers and companies to adopt complex solutions—such
as dynamic linking instead of static linking—to avoid compromising
their own business models. This complexity has led, in many cases, to
the license's legality being ignored in certain regions, creating
uncertainty about its practical...