I remember the first time I typed far too much into a text message on Google Voice’s website and the character counter was replaced with “Really?” Made me laugh.
But yeah, in this case, maybe something more tongue-in-cheek like “How lucky ARE you?!” would work.
My point was that they excluded the majority of the mobile market—precisely your complaint. Why start with a native app at all? Webapps can run on any smartphone platform, and desktop too.
Who doesn’t understand whom, really?