I can address two of those points (one for my company and another for YC companies in general):
- SSL: We're on that list as HireHive.com, which had a login and used to have an SSL cert, however, we shut it down (i.e., it just redirects now) and now run Hackruiter.com and HackerSchool.com, where our cert is now. We never had logins online without a proper cert. The data from OP is wrong.
- So many YC companies use Amazon because Amazon gives large cash credits to YC companies meaning it's effectively free to use for the first couple years. Also, many of us are built on services built on AWS (e.g., we use Dotcloud).
EDIT: Typo.