True in the current state of LLMs, possibly not true forever if someone finds the magic bullet that turns the one-shotting (reliable) software dream that companies like Anthropic and Perplexity currently peddle into reality. Seems far-fetched ATM but the gains since GPT-2 have been very real.
We're quite a ways away from this though, even with Opus 4.6 and the like. And even further from it being part of Claude Code rather than some proprietary $1000/mo. closed-source solution.
As you say though, _if_ such a technology were to exist, it's Anthropic that holds all the cards, not random entrepreneur #25721 who is asking the Anthropic API the same thing that the actual customer could just be asking directly. At that point you're an undesirable middleman, not a business.