Yeah, you do not need an oracle for USDC.

But I don't see USDC being mentioned in my reply or the comment I replied to.

And calling the need for oracles a "hard problem" is a neat euphemism the point of which escapes me. It's not solveable.

As someone else wrote: when something goes sideways with their assets the crypto posse call for law enforcement. Or they bent their own rules (DAO/ETH hard fork, 2016 e.g.).