Anal sex may be normalised by porn and be an issue.
But I can guarantee you, with 100% conviction that no one, ever in the history of anything, went online, found this card website, searched the anniversary section, located this card and did any of the following
:Send it to their significant other to signal consent for anal.
:Use the card as a rape apologists excuse for anally raping someone
:Send it to a teenager to pressure them into doing something they don't want to do
:Use the card to promote anal sex in any way shape or form as being the norm and denoting everyone else as prudish
I can stake anything you like on that, so sure is my conviction.
I'm all for making sure that positive messages about consent and sex are passed down to our young people. But OP you called this wrong and the band wagoners did too. Please don't mass mail a small company to complain about this just because you don't like the card.