for me it was that one guy calls it "the best messaging app" , then federighi implies that it s not really and they d need a lot of effort to make a marginally better competitor.

Also how they admit that a busy messaging service "does not cost us a lot to run", but HN constantly defends the 30% tax for app store storage space

so yeah like HN, except in HN this would start an epic flamewar "how dare you say that"