This question is asking a question that can easily be answered by reading the resources from the well known resources (FSF and OSI).
I think such a question is a FAQ regarding Free Software and Open Source. Are FAQs on-topic on this site?
FAQs are generally considered on-topic on every site,* and I see no reason why they shouldn't be here. That doesn't mean they're good questions, but the commonness of a question or the lack of research shown doesn't impact their on-topicness. If you keep at least one version of each common question around then they also serve as good duplicate targets, and there's always the possibility that an answer might be written on it which is genuinely better than anything available anywhere else on the internet.
*(One exception being English Language & Usage, but that is an exceptional site, with dozens of questions being asked every day which can be trivially answered through looking at any dictionary.)
As I asked the question I was fully aware of the answer. Still I asked, to show that the focus of this site can go beyond questions about licensing.
So, the answer could be googled, but that doesn't mean everyone does. In reality many have unclear concepts about open source although it is well defined and easily googleable. Look at the discussions about CC-NC and CC-ND.
So in reality people miss concepts and they aren't even aware that the answer may exist in public resources. Some SE-sites have in their description if they are for professionals or enthusiasts or both, we haven't that this clearly defined. Professionals should know this, enthusiast or people interested not, so which user-groups do we want to include?