They're scammers of the first order, sitting behind the wall of internet to hide their true colours. If you commit a simple mistake of giving your card details to them, they'll simply milk it whether or not they provide any service.
I signed-up for a trial, but my account was not created. When I tried to unsubscribe, they told me you don't have an account with Scannero. However, within less than 24-hours they deducted 50$ from my card.
But they're very professional in scamming, they'll duly send you a receipt of the money they've milked from your card ;)