No login, no password, you own the voucher then you can finish the payment.
No need to register an account. Without exposing any personal information, you can use voucher directly. You can get vouchers from anyother, and spend voucher to get what you want more conveniently
Anoymous indeed, instanly without network confirm. Not everyone is familiar with currencies (set up an wallet and buy currencies from others, and wait long long minutes for network confirmation). But everyon is used to vouchers, using one code to do everything