Top and 3rd comments on the HN thread are both criticism, and if you actually read the follow up article on tech crunch:
Some say it’s dumb, some say it’s great, and a lot say something in between
What do I feel about it? It feels fresh
Mind you, it’s on a massive hype-train right now so take it all with a grain of salt
That doesn't sound like you're not allowed to criticize a startup.