Legal question. If Windows on the linux kernal needs to open source, but that does not apply to other software it runs, right? So could they close source their DE and charge for that, or charge for the windows store?
That is correct. Microsoft could simply charge for their closed-source desktop environment or their package manager or their software environment in general, but any modifications to the kernel would need to be free and open-source (though they could still charge money for it).
Only changes they would make to the kernel. There is no obligation to make an OS utilizing the linux kernel open source.
An oversight by the developers. Had they licensed it under the GNU GPL v3, such a thing would not be possible.
No, the GPLv3 changes nothing in this regard.
Legal question. If Windows on the linux kernal needs to open source, but that does not apply to other software it runs, right? So could they close source their DE and charge for that, or charge for the windows store?
That is correct. Microsoft could simply charge for their closed-source desktop environment or their package manager or their software environment in general, but any modifications to the kernel would need to be free and open-source (though they could still charge money for it).
thanks for the answer.