I've heard of the reseller sites using stolen credit cards but I've never heard of them reselling review copies.....

A comment under the video suggested: For redemption of review copies developers should state an expiry date of 2 weeks to redeem, before invalidating them. I think that's a good suggestion to prevent re-selling, 3 weeks to 30 days if they're doing a giveaway.

Not sure if OP is also video creator, but they weren't "stolen". These were keys given away in good faith, but you got scammed. It's an honest mistake as a first time developer, and as the video mentioned, but YEAH this is a huge problem where there is a marketplace that doesn't benefit the original creators of games. Good watch, but I'd like this to go deeper. I'd really like to know if this situation is the same for large studios and small alike.

How many review copies are handed out? Does this have an actual significant impact on # of sales?