Well i suppose they are not banned from all manufacturers. Was the kit an old version or a more contemporary one?
Perhaps the bigger brands who sell the larger bulks of kits prefer to tread more carefully by not using swastika in order to avoid any financial repercussions. It's a cooperate move isn't. You sell the german kits without swastikas to please the mass market and no one will question your ethics or political views. I also had a BF109E-1 1/72 I bought for 23 years ago. It was Hasagawa, which was the dogs bollocks! It too came with swastikas on the decals.