Illuminata Analyst Gordon Haff is quoted as saying
If people get the impression that even inadvertent license violations will get them involved with lawyers, you could well see some making the call that it’s safer to stay away from open source
The GNU GPL is not an “open source” license except that the Open Source Initiative organization placed the GPL on a list of approved licenses. This is trivial in comparison to writing and maintaining the license. The GPL was written by the Free Software Foundation, an organization which tells us that they “are not against the Open Source movement, but we don’t want to be lumped in with them” because there are real and significant philosophical differences between the two groups, differences that sometimes lead to radically different conclusions about the harm of proprietary software.
The language and development of the GPL proceeds along the line of defending freedom, something which the Open Source Initiative rejects due to its philosophy which aims to convince businesses and programmers that developmental efficiency is essential. The most recent revision of the GPL (GPLv3) is the first version any open source proponent had a hand in helping to write. The previous versions of the GPL were written before the OSI existed and before there was such a thing as the open source movement. To frame this issue as if “open source” is somehow generic term is merely an attempt to make that philosophy seem more entrenched than it really is (or to define its freedom-eschewing philosophy as the norm).