[flarex]

Blockchains solve the trusted intermediary problem which is far more general concept than double spending. It's also a common misconception that blockchains are anonymous; they are pseudoanonymous and there are companies devoted to de-anonymising and tying real world users to transactions. They do this quite successfully. There are ongoing efforts to completely anonymise computation and transactions on the blockchain using ZK snarks but most today are not using this. Also those use-cases you mention are the low hanging fruit, but as more time passes and the technology matures I expect to see a much broader range of uses for trust-less computation.