A “kid” told me his move.
Purchase a pre paid card, such as visa, from any store.
Pay for the card wish cash.
You do incur an upfront fee.
You can use that card to buy things on line, or from stores and not leave a paper trail.
We have two college age GK’s. We send checks each month to their parents to help pay for their college expenses.
Then, my wife best West Coast friend, suggested what you posted. So the GK’s get a modest monthly mad money to do whatever they want to spend it on.
They do not use it on line as that triggers a cascade of potential sellers to their online #’s.