If buyers aren't allowed to use VPN or Tor it doesn't make stealthsnets cards private. If you've got to give your address & email address there's a privacy problem before you've started using the card.
You need to activate card after purchase. Card issuer will ask for email and address. It's not allowed to use VPN/Tor on redemption, you should provide a valid email address.
It's kind a silly not to allow people to use Tor or VPN when they are paying for this virtual cards with monero.
It's even worse that we have to provide real address and email address.
If someone is willing to pass or bypass that, than having 3DS support is a good thing.