But even if not, there's still value in raising the barrier to entry. For example, you can buy 1000 reCaptcha solves for $1-2 from various captcha-solver services. And yet that $0.001-per-request fee does discourage mass-scale bot attacks.
Don't you...
Let's say I'm running https://grep.app/ for example. AI bots start heavily using it, costing me a ton of money. How would you magically design this so it doesn't matter if the end bots are using it?