Just a quick note: Safe DBC’s will be treated as cash equivalents under most laws and very distinct to the laws around Gift Cards or Certificates which can only be exchanged for “goods or services of a specified value from the issuer”.
The difference is important to recognise because if someone tries to sign up a bunch of Safe DBCs and sell them then they will fall under money transmitter laws, whereas a shop like Amazon printing gift certificates that can only be exchanged for items on the store would not.