It’s really annoying buying an eBook and have to pass it trough Adobe app, to get an EPUB. To then discover that I need to register my e-reader with Adobe to read it… wtf? I just use calibre with plugins and remove the DRM.
But at this point it gets faster downloading a pirated ebook than buying one. Why publishers don’t actively fight the book piracy and offer a better way to read eBook? The eBook market is large. And kindle is not an alternative solution since uses a proprietary format. I’m a proud user of Kobo for that reason