I don't think it's the semantics that matter. It's the use case. If you rely on a library with a non-permissive license (ala, something tighter than MIT), then

I don't think it's the semantics that matter. It's the use case. If you rely on a library with a non-permissive license (ala, something tighter than MIT), then you are restricted (aka, not free) to use it in those cases, like commercialization in the case of the mentioned licenses. This is a Very Bad Thing because it keeps really good software from making it into commercial use over fear of the restrictions in the license. (APGL bans are great example.)