I draw the opposite conclusion, as all of your examples are from several years ago. Three of your four links are more than 1600 days old!

Ever since AirBnB became the most valuable company in YC's portfolio, there has been a remarkable groupthink on HN where everything they do is good and criticism basically vanishes. Yet criticism of a non-YC company like Uber gets upvoted and creates a big dogpile, even when it could be equally applied to both companies.