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Neither of those require a fleet of GPUs powered by a hydroelectric dam to balance the accounting.

The former point almost certainly makes small disposable servers in a variety of jurisdictions a requirement. There might be many millions of crypto users around the world, but there are very few running their own nodes, and fewer still actively mining. Block generation is practically as monopolised as the banking system it supposedly replaces.

To the latter, I worked a cryptocurrency casino and the provably fair algorithms were implemented using the core Node.js crypto libraries and completely independent from all the blockchain nodes. The sheer frequency of by users completely rules out any chance of leveraging a smart contract or block data as a base for the RNG.