Valve is not your friend it's a for profit company that is also one of the largest Loot Box pushers and NFT sellers.
Sure there are some subteties to a centralized server vs. a distributed ledger, but the core goal is the same: companies want to be a platform owner, allow for generation of some speculative assets for users to trade, and take their cut as a middleman. To my knowledge, it's the middle factor that many have issue with.