PSNow added the ability to download games after GamePass had been out a year."curated quality content" is a matter of opinion. Have you been to the PSNow site and looked at the library lately? The home page is full of what many would consider to be "curated quality content". I'm not saying PSNow is better, I'm just taking issue with the thought that Xbox is the first or best "Netflix for games" option. They're definitely not first and not the most and it can be argued which has the more "high quality" titles.
A this point it's comparable but you really can't pretend a streaming service is the same as GamePass. GamePass is definitely "first" relative to PSNow as a game download service.