You're correct that prime is mostly about getting people to buy more stuff. But the purpose of prime video (and music) is ALSO to replace Amazons dying (dead?)

You're correct that prime is mostly about getting people to buy more stuff. But the purpose of prime video (and music) is ALSO to replace Amazons dying (dead?) revenue streams of selling DVDs (and CDs). That was a huge chunk of Amazons business at one point and they correctly recognized that streaming would eventually replace physical media.