Unfortunately there's still no information on the matter. Neither Tobias nor Brodie know pretty much anything.

However I would say the reason for the ban has to be illegitimate if the truth remains hidden even after the negative public reaction. From my knowledge on the FOSS development world and community, the chance of the reason being political is fairly high as the FOSS community stupidly doesn't respect anyone right leaning. The "we won't let you change our system" reason is also possible though.