The publisher is not always the same for a print book and for the digital version.
Expecting the publishers to give away a free digital copy when you buy the print book isn't a reasonable expectation IMO. For one thing, it cheapens the digital copy making it seem like "less" of a value, when in fact a digital book offers more benefit and value. Multiple readers at the same time, font size control, built in dictionary, etc. If a user wants both versions, they need to buy both. You don't get a free paperback when you buy a hard bound copy.
Amazon tried with their Matchbook program which offered a digital copy at a discount if you'd bought the print book from them. Most publishers didn't jump on that program.
Many digital reader users don't want both versions of a book. I know I don't.
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