A good few years ago now, I watched as my two cousins, Steam voucher in hand (and he didn't even have a gaming PC btw), faffed about with one of those sites promoted by shady Youtubers.
Codes went in. Buttons were pressed. Glances were exchanged.
"Now what?" asked the younger one who's Steam voucher it was.
"Oh nothing," said the older one. "You lost."
I think it was only teenage emoism that stopped him bursting into tears right there.
He's an accountant now, so I assume he learned an important lesson about gambling that day.