https://steamcommunity.com/profiles/76561198409001436/

This person has added me though this group of Humble Bundle users, asking for trades. He even says he is adding people because of Humble Bundle keys on his profile, and he has been adding plenty of people with the objective of performing key trades and, to ultimately, scam people.

He effectively scammed me through my steam account, and continues to do so with this profile, which I assume is not his only profile, because he is not activating those games on his account. I lost 4 game keys for him in this manner.

He is using this account to fraud people. Flat out.

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What he did was somewhat classic. Wooed me, saying that because I had more games than him he would send the key first. I said I wanted Flight Simulator 2020 because I had many games he was interested in, that would make up for the hefty price tag. He said he couldn't do it at that time, but could do Doom 2016 (that was high on my wishlist). He sent the key first, and got the games he wanted for it after a bit o haggling.

Then he brought a hazy story, saying a friend would help him get me FS2020 for some keys, put up a list, wanted 10 keys upfront. I instantly denied him that, said I could get 3, he insisted on 4 so I said what the hell... He was using the leverage of mentioning that he did send me the key first on the first trade. Sounded fishy and all, but thought I´d byte,

Then...
He never replied me again, no matter the way I approached him. I posted a comment on his profile asking him to come through with his part of the trade deal, which he deleted.

As both Humble Bundle and Steam TOSs forbid trading or selling of keys (to my knowledge at least), I come here with this complaint / denouncement as a cautionary tale so other people wont fall for it like I did. And if you did fall for it, please report him to Steam as I did.

Also, I am accepting advice as to how to proceed other than reporting his profile to steam as the Scammer he is.