Remember, Wanda is not the onyl Croakamancer out there. Normal Croakamancy magic is fine by the MK. It's this new type, Decryption, that has them all freaked out.
Yes, but I don't think its Decryption itself that has them so worried. I think its how she's using it that freaks them out.
You have to remember that the nature of Erfworld has discouraged any one side from becoming TOO powerful. Yes, Jetstone is powerful, but they know they can't conquer the world. They know that conquering a neighbor like Haggar would siphon off forces that would leave them weak and vulnerable on other fronts. Remember Vinny's narrative in the Summer Updates where new sides pop casters that they need
. There is a balance. That balance has become the status quo.
Wanda is upsetting that status quo. That's why MK is up in arms. (And Charlie)
Look at it as if it were a game : Your a DM/GM with players who are all competing with each other. One of them finds an exploitable mechanic that lets them dominate the game. Do you :
a) Them's the breaks. Let the Rules-monkey win, and congratulate them for it.
b) Make a house rule and smack that monkey down.
For the moment, Erfworld is letting Wanda run with it.