QR is easy to make yourself, consequently there is a large space for different kind of Scam. I. think that the original QR was designed for another. The scope of the other.
By the way, now pay QR works great on receipts from any public utilities and state institutions.
Why is not working? Because to pay for QR you have to scan each item, but now for you it makes the seller at the checkout.
When I think of self care, then maybe things will change, but while taxis and cash services.
By the way, the Sberbank is launching the ability to pay by QR. Can search online as it will work.