Being unhappy is not the same as 'its not allowed', as much as various corporate interests may wish it so.
That being said, I'm not a lawyer AND I'm not truly clued in here but I suspect that Tolkien Enterprises does not actually own MERP, however, they DO own all copyrighted information in MERP. So I suspect the .com guys are, in fact, stomping alll over that IP. Of course, given that its all 50 years old and more, it all should have been public domain by now anyway. I mean: I know its not, which is something of a tragedy.