It's a good question, just addressed to the wrong person. I, unfortunately, do not have the authority to answer your question. In this case, the question should be posed to theymos. Only he can answer you. If you want to hear my opinion, I think that if the license keys were obtained legally, then why not.
I am asking a general question regardless of the fact that I quote your post, taking into account that you are the only staff active on this topic. If it was really about MB licenses as the reason for the perma-bans, I'm just asking everyone what will be illegal in Digital goods tomorrow and whether everyone who sells something there risks a perma-ban. If we're going to be honest, little in that board is really legal, whether it's software licenses, streaming services, or more than clearly illegal IPTV.