Yep it does ahahaha. It's not a steam bug, but there is ways to tamper payment gateway, avoiding/tamping payment sum
. Don't trust me, trust IEEE :
https://www.ieee-security.org/TC/SP20...1/paper029.pdf (this is an academic paper).
So, what's the deal about "why plp doesn't exploit dashit hells out"? Well, every payment system do have an anti-fraud system, where it's correlates payment vs actual funds (paypal supports it now just because of that paper ahahahaa)... so if you do that often they can just detect. So it's mostly a thing that you do to buy "the mostly expensive game", but don't do too often ...
So, yeah such thing can exist, but not for too long. Every things that became too often, became detectable
. There is always the chance for someone be cooking a 0day, but I bet that plp who can get 0day, will sell it ahaaha... And don't burn it just selling cheap games ahahaha....