Wouldn't some level of per-account rate-limiting make sense? Say, 1000 searches per hour? It's commendable and impressive that Kagi has apparently been able to

Wouldn't some level of per-account rate-limiting make sense? Say, 1000 searches per hour? It's commendable and impressive that Kagi has apparently been able to get this far and perform this consistently without any account-level automated rate-limiting but the only alternative is an inevitable cat-and-mouse and whack-a-mole of cutting off paying customers who knowingly or not violate the ToS. Returning 429 with actionable messages makes it clear to users what they should expect. You obviously want the block-interval to be long enough to not cause too much additional churn on the database. Applying restrictions on IP-level when you can avoid it is just a world of frustration for everyone involved.