I think they are referring to the MIT license and similar, but not wording it well. I can take something that is MIT-licensed and incorporate it into a closed-s

I think they are referring to the MIT license and similar, but not wording it well. I can take something that is MIT-licensed and incorporate it into a closed-source commercial product, and I am not forced (as I would be with the GPL) to open-source my entire commercial product. They feel this is not truly "Open Source" and it is wrong to accept licenses which allow this behavior as "Open Source".