@StopHarmingMonica yep, but that would mean that they would fall in the problem that
John pointed out. So, yep, others couldn't use the 4.0 license - but so wouldn't SE. What I meant is that the original claim I linked implied that the switch was made so that SE could use the content while OTHERS could not - that is invalid -> if the license upgrade is really not legal then they too have lost the license on the content.