As I knowFor this one, I had also questioned so, until I happened to hear about the reason during SG Open from a Boon Lay player, and I believe what I heard of was true. It is an "other" reason. It is a sad reason, but believe me, definitely no evil contents inside. It is a sad reason that I do not want to announce in a forum, but you may ask your friends from Boon Lay.
With no evil contents is good enough.