The problem with all of the commercial blockchains you mentioned is that their security properties are more akin to having a shared Git repository with the ledg

The problem with all of the commercial blockchains you mentioned is that their security properties are more akin to having a shared Git repository with the ledger data in it rather than Bitcoin. The fundamental property that people think of when they say "blockchain" is that all of the ledger data can be validated by any suitably-equipped network participant. This 100% trustless design is interesting, but the security model it relies upon prohibits pretty much anything more than tracking tokens issued entirely on-chain. The moment you want a blockchain to interact with the real world, you need to introduce trust back into the system. Which removes much of the claimed benefit of blockchain. Such systems might still be useful to people, of course; but that's not what the blockchain/Web3 people actually want to sell. The elevator pitch of blockchain is "trustless decentralized finance", and Web3's is "replace advertising with financialization as the funding mechanism for online media". Both concepts do not hold up to the marketing hype, even if there are use cases for them.