I hope publishers have begun to realize that proprietary DRM only furthers the lock-in of parties like Apple and Amazon, and makes it even harder to resist thei

I hope publishers have begun to realize that proprietary DRM only furthers the lock-in of parties like Apple and Amazon, and makes it even harder to resist their bargaining power, because now millions of your customers have huge libraries that only are readable on $COMPANY_DEVICE, therefore they are much more likely to buy that device in the future, and you will be forced to sell through them.