

At a guess:
- People with steam accounts and VPNs in countries that steam doesn’t operate in. Steam will block your “foreign” credit card as a fraud risk, but eBay dgaf cos it’s the sellers problem if they get ripped off
- This is probably a pretty convenient way to send small amounts of money to people in a way that looks pretty legit. Arrange to buy some drugs off someone over telegram, they get you to buy a “steam card” from them, they send an envelope with a blank bit of cardboard and the drugs
If you are going to propose a law, you need to define “stupid”