I don't think it can be called cash since no one is going to accept it.
Like it's so stupid, even if the other person were to accept bitcoin or whatever they'll still need to verify if the address contains crypto or not and whether the private key is valid (both of which needs internet access on some electronic device).
Proves how fucking silly crypto is when he has to send 0.006 of it to get a nice normal gift card number like 100$, and its not even gonna stay like that anyways.
Love to have to pull up an app to check what my 0.000000000173 bitcoin gift card is worth in this one second so I can figure out if I afford pizza or not.