Assume an auditable, anonymized transaction system. See, now all your objections are merely implementation details! In the previous toy example, I was refering

Assume an auditable, anonymized transaction system. See, now all your objections are merely implementation details! In the previous toy example, I was refering to 'already implemented' in the fictional Widget Market transaction system - things that could feasibly be created, rather than existing tools, iow. There are, fwiw, thriving anonymous reputation systems in the real world, though none directly implementing blockchains, afaik. The Dark Web is full of them