if the first thing I get when trying to play with a new service is "log in/create an account" => Instant CTRL-W. don't have any buy-in to your product yet and

if the first thing I get when trying to play with a new service is "log in/create an account" => Instant CTRL-W. don't have any buy-in to your product yet and you are asking me for upfront time and personal data investment.