Why would anyone “buy” movies from PlayStation. That’s not their business, I would never have expected them to be in it for the long haul, just like MS did a rug pull on this a few years ago didn’t they?
It was their business, because they sold them....
Convenience? Maybe a belief the media would be accessible for a long time, versus the ever-changing catalog available from streaming services?
Consumers are lured into walled-gardens all the time - consoles, app stores, hardware. Where would you suggest someone purchase a digital license for a movie?
Why not? Maybe people already have an account there with payment set up, the console hooked up to the TV and soundbar and don't want do sign up somewhere else?
Furthermore, Sony Pictures is huge, so selling movies is absolutely part of Sony's business as a whole.