Meh, blockchain works to create records or ownership that are hard to forge. It doesn't work for money because individual transactions are too expensive to use it for small daily purchases. Bitcoin et al are a bubble because there're no actual value in "money" that's too expensive to spend.

For something like this, where the record will rarely change hands, it makes sense. I've advocate, for years, using blockchain to implement intellectual "property". Instead of a Steam key, you'd buy a token representing ownership of the game. The publisher pays hosts (Steam, Epic, whoever) to host the actual files for download to whoever has a valid token. You could also use it to verify online play and virtually eradicate piracy, but it would also be impossible to eliminate the second hand market.

It's important not to lose the forest for the trees. Blockchain is not the threat, the threat is getting rid of our ability to engage with each other without government intervention. This actually removes the requirement for government as transfers of ownership could be done without requiring any record keeping on their end, so long as the token is decentralized.