The only reason why movie studios do this is greed. They're afraid they'll lose money if they put everything up as streaming. And it's ridiculous. For example, "The Expendables 2" is available streaming on Netflix... but the older film "The Expendables" isn't. What the hell, Hollywood? They have to realize that for a large number of people, not having something available streaming or affordable means that they're just going to torrent it. They're losing money in the long run. You can't stop the signal.

Amazon is allowing publishers to "voluntarily" opt out of allowing their books to be TTS enabled. In other words, Amazon has caved and is allowing publishers to sell crippled versions of their books.