Because in order for books to be made, authors have to eat, and giving infinity of a thing away makes it worthless, since anyone can find a free copy anywhere. So the contents of the ebook are protected by copyright laws and the author licenses out that copyright to sell copies, in essence.
If it wasn’t for us deciding that we need to pay money for goods and services, this wouldn’t be needed, and other than copyright protection we add to the file to enfroce this, there’s no technical reason any electronic file couldn’t be copied digitally an arbitrary number of times.
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