> And it's easy to find examples of for-profit companies that use (and abide by) any one of those licences.
You can also find companies that don't. I am under the impression that nprobe source code is under the GPL [1] but the author sends DMCA requests to those who want to use the source code under the terms of the GPL [2] [3]. Then there was the company who created the entourage edge (an Android powered device) - for the longest time they refused to release the modified kernel source....they eventually did then they went under.
You can also find companies that don't. I am under the impression that nprobe source code is under the GPL [1] but the author sends DMCA requests to those who want to use the source code under the terms of the GPL [2] [3]. Then there was the company who created the entourage edge (an Android powered device) - for the longest time they refused to release the modified kernel source....they eventually did then they went under.
[1] http://linux.exosec.net/mirrors/www.ntop.org/nProbe.html
[2] https://github.com/github/dmca/commit/859890b8aaf4db678dce96...
[3] https://github.com/github/dmca/commit/85c03a289fe56c67636ed6...