same here, I actually love it when publishers publish epubs, it encourages me to purchase more stuff from them. Same with bandcamp stuff with music files. A lot of times publishers are very ambiguous about the nature of their ebooks and I have to email their sales team or customer service to get a square answer about what exactly I would be buying from them. If it's some complicated morass of third party obscure e-readers and other clunky interference I just end the conversation there and move on.