Embedded systems builders prefer non-GPL foundations in order to legally restrict access to their custom source code. Of course, that is a business decision.

Embedded systems builders prefer non-GPL foundations in order to legally restrict access to their custom source code. Of course, that is a business decision. Tech-savvy buyers often prefer open access to the source code of the stuff they buy. Apple, for example, uses an old derivative of FreeBSD and has added numerous proprietary extensions. For the majority of buyers that is fine.