Let me just say it plainly and simply.
IT DRIVES ME NUTS!
I can be a bit of a Karen when it comes to spelling. Mistakes happen, sure...and if there's a cute kitty involved, well, I admit I have a soft spot for Lolcats... (because... they're cats. Who knows what they really sound like other than meow? ;) ),but there is something about calling the author ANM that just bugs me. Mistakes happen, but this is obviously intentional.
I know there's some inside joke that I must have missed, but I truly don't get it. I don't see any point at all in changing the middle initial of her name. Is it easier to type? No...because you're adding a different letter, where as before there would only be two. Nor does it have any alliterative sense, as in Kristy's Krushers. To me, it makes the people who do this repeatedly look like they can't tell the difference between an N and an M (which is clearly shown on every single cover of every last one of her books.)
As with those people who always mess up your/you're and their/they're and there, it makes me cringe and I have to bite my tongue (or clench my fingers if you will).
Rant ended.