Hacker News Reader

Because if you lose that single sign-on account, you lose everything attached to it as well.

Amazon offers many services, of course they are going to want users to have one set of credentials to access all those services.

There are trade-offs to every security approach, but storing passwords at every web service is 100x worse.

I don't understand your concern. We all have numerous accounts all over the web. Having one or two more doesn't increase our attack surface 100x.

What have passwords anything to do with this?