The people who stand to benefit are you. If I have to pay a lawyer $1000 to review a contract, or spend $10 in tokens, I win. OpenAI may make $9 off of those tokens, or they may make $1. But that doesn't matter at all to me. I care about the $1000 vs $10, not the $9 vs $1.
It certainly does, but that's not guaranteed with humans either. Nor is it the only factor that matters. It's a cost benefit tradeoff. If I am on trial for a crime, obviously I will pay for the quality. If I want to know what some language in a simple contract means, I will ask a LLM.