Sure we have. We don't have a perfect solution but it's miles better than what we have for LLMs.

If a lawyer consistently makes stuff up on legal filings, in the worst cases they can lose their license (though they'll most likely end up getting fines).

If a doctor really sucks, they become uninsurable and ultimately could lose their medical license.

Devs that don't double check their work will cause havoc with the product and, not only will they earn low opinions from their colleges, they could face termination.

Again, not perfect, but also not unfigured out.