Kenjitsuka said:
I don't think Valve is overreacting too much.
He should've thought before acting like this on an account used for his job...
Can you overreact too little?
Valve is known for its heavy-handed approach to these kind of things. But in other cases when people expose exploits in TF2 for example, such as recoding crate-a-pults (that MIGHT be the actual name...) to be usable as a key since they are the only item besides keys usable on crates, which was more quietly exposed to Valve because it would have broken the economy. And then they gave them unusual hats!
(But one of the guys asked for an unusual which the TF2 Wiki people didn't like him having [unusual wiki cap], so they got butthurt and asked him to pick a different one. Guys. He's one of the two people who saved the TF2 economy. LET HIM HAVE YOUR STUPID HAT.)
Considering the kind of thing the OP says this exploit could have created gateways to, I think Valve's reaction was actually pretty gentle. If all the repurcussions last only a year, damn, that's light.
Good intentions, but he didn't think it through. Nobody's the bad guy, here.