I don’t think it’s any different than asking someone to proof read your card or buying Hallmark cards. I don’t think t or anyone else needs to know how you write your Christmas cards.

I’d say if you gift a painting signed by you but you didn’t really paint it, then you need to disclose. But that’s a card. You aren’t claiming any copy rights, so I don’t think it matters.

I am terrible at writing cards so I usually don’t, but if must, I ask other people what I should say if I am trying to express XYZ. I don’t think it’s a big deal