Ah yes, yet another service that wants my email address without ever telling me what for, no privacy policy, no promise not to spam, nothing but vague but unhelpful description of a service.<p>Pass, thank you very much.
Is hiding an input element really more functional than just having an input field appear on the page? The simple fact that it required instruction to use: "Hint: click or drag on the page" (and rather ambiguous instruction too as there are 2 "pages") belies the functional simplification that it seems to present.