The upshot of the BSD-license in the case of FreeBSD is that it has found it and its components used in many commercial products, including MacOS/OS X, the PlayStation’s Orbis OS, and of course the BSD networking stack is happily used in Windows, macOS and just about anywhere else. Meanwhile the GPL forced Linksys to open the firmware to its WRT54G series of routers, ultimately leading to the development of OpenWrt and similar projects.
They make it sound like the *WRTs were the worst thing to happen to consumer networking and that corporations not being required to contribute back to projects has made BSD stronger, rather than given companies free labor. I find the *BSDs to be pretty interesting, but let's not pretend that they're benefiting from companies using their work. Very shilly tone to this article.