Blockchain is a solution to a non-existent problem. Plenty of other games have sold hats or skins or whatever before this, without blockchain. This is also not going to even be a 'real' blockchain, GSC Game World is going to control the blockchain at all times, and I doubt any customer can peruse the entire record. At any time they can render somebody's model or jpg or whatever utterly useless, either by shutting down the servers or just literally deleting it. Energy costs associated with this.. who knows. It will be additional energy wasted, additional servers used, in addition to the game by itself. Even assuming this is energy cheap, this is just going to be used for money laundering, most likely, with some skimming percentages off the top by GSC Game World in the marketplace they will control.
We're literally watching the dissolution of human civilization in real time; I'm only being slightly melodramatic here.
GG greed, you remain undefeated.