I just noticed that the first page showing in RF has considerable overlap with those showing as RM. I clicked on one at random, and it's marked RF AND RM, with no obvious reason why anyone would choose to buy RM at a higher price than they're charging for full size RF, with no exclusivity.
 

I had seen some like that too. I think that the person offering them hasn't got a clue what they're doing. I saw one where the RF license was cheaper and offered more rights than the RM license. It's an IQ test for the buyer.

I don't believe FAA is approving or monitoring license terms at all, so they'll let contributors do whatever they want. Sean (Mr. FAA) seems to believe he knows more than those of us who've been doing this for a decade, so I'm not inclined to take another tilt at that windmill (I participated in the discussion on FAA when this was in beta).