[semiquaver]

Rot13 a challenge string. It could be any arbitrary function.

[loloquwowndueo]

That wouldn’t have the fallback rate-limiting functionality. It’s too cheap.

[elcritch]

It’s too cheap as a rate limiter as it is if you read TFA.

[trenchpilgrim]

That's a configurable setting.

[semiquaver]

There’s no possible setting that would make it expensive enough to deter AI scrapers while preserving an acceptable user experience. The more zeros you add the more real users suffer, despite not creating much of a challenge to datacenter-hosted scrapers.

[loloquwowndueo]

Real users suffer much more if the site is entirely down due to being DDoSed by aggressive AI scrapers.

[semiquaver]

Yeah, and if this tool doesn’t stop them then the site is down anyway.