something else interesting is that these companies all have zero or minimal product costs, so these egregious growth spurts aren't really anything but signups.

something else interesting is that these companies all have zero or minimal product costs, so these egregious growth spurts aren't really anything but signups. No retail company can really utilize the same techniques. Imagine a hardware company or physical product company that got a 75,0000 customers over night. The only thing happening the next day would be customer support emailing order cancellation notices. I don't know why this strikes me as relevant at the moment but it does.