I've been looking for a cheap book to buy since this topic went up, so I could test if I would still get the email from Walmart.com whenever I buy a Kobo ebook (even though it's always been through a Kobo account / Kobo app). But this has been a slow week for books on sale that I want...
EDIT: Just grabbed a Philip K. Dick book on sale for the sake of testing. Still getting an email receipt from "Walmart eBooks" (although the sender is
noreply@kobo.com). Amusingly, though, half the URLs directly embedded into the email no longer work.
As long as it's purely cosmetic and everything still works through Kobo, I don't really care whose entity is on the signature. I'll be sad if Walmart.com stops selling Kobo Gift cards in the future, though, because I was planning to buy a Kobo for a friend's daughter and suggest the gift cards as a way to give her some autonomy with book choices without having access to her mother's credit card.