I was wondering the same, why not add more options, just make it easy for people to get paid by whatever they want. Its also possible to simply just put a .txt on your public shared library and you can always list everything and anything you want there. Its just nice to see all that nice verification in the public profile nice and easy to see for everyone else.
Perhaps they'd be worried that their tool would be used primarily for narcotics trade. Oh wait, they already have zcash. Well, perhaps it's the redundancy between those two.