The GPL and copyleft are not magic pixie dust. Just as proprietary software is pirated very frequently, so too do companies and individuals ignore copyleft lice

The GPL and copyleft are not magic pixie dust. Just as proprietary software is pirated very frequently, so too do companies and individuals ignore copyleft licenses. Like the BSA spends money to enforce proprietary licenses, so to do the FSF, SFC, gplviolations.org and others have to spend money to enforce copyleft. There are also lots of violations of permissive licenses, but generally the authors of permissively licensed software do not bother to enforce their licenses.