Spotify etc. helped curb piracy because it was convenient. Ebooks should be convenient, but are not. The experience is much worse than physical books and barely any cheaper. It pains me everytime I try to buy one. Then came the ipad, and while the ipad is terrible for long reading it isn't obvious why an ebook would be better so most dismiss it right away.
We must have different reading habits, because my experience has been the exact opposite. On my Kindle I can read every book with the same font, same text size, same layout, same backlight. I don't have to struggle to balance big heavy doorstops, a book feels the same in my hand whether it has 200 or 1200 pages. The latest Paperwhite models are waterproof too, so I can take mine with me in the tub with no fear of dropping it in the water and ruining it. I read dozens of books each year, and a big reason for that is how convenient it is to do it on an e-reader.
Now, tech books, graphical novels, comics? For sure an e-reader sucks for these, and I still buy these in paper form, but for plain words (fiction and non-fiction)? You can pry my Kindle from my cold dead hands.