Earlier quoted context omitted.
The license itself may not discriminate, but they may issue (and subsequently revoke) the license to whom they will. It's like some companies licensing with AGPL and then issuing LGPL or even proprietary licenses to whoever pays them for it (so they can use it in their projects at their own discretion).
I see "The license itself may not discriminate, but they may issue (and subsequently revoke) the license to whom they will." meets the letter-of-DFSG but does it meet the spirit? If I choose to grant a GPL license to only green-eyed people, would that meet DFSG's defintion of non-discrimination? By your argument, yes: the license itself is not discrimination. Yet I do not think that meets the spirit of DFSG.
Yeah I fully agree with you - it's very strange but apparently this is common practice