The researcher was able to claim 36,000 free keys for Portal 2 using this bug
Article writes 20,000 GBP (26,000 USD), but then proceeds to write Researcher got 20,000 USD. It's a significant difference, so which is it. Other than that, very good that people get rewarded for such matters. Researcher didn't abuse anything, and stopped potential criminals from abusing a bug. Good on Researcher, good on Valve.
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