The WebAssembly challenge (as of yet unreleased, it's been in dev for a year and I don't want to enable it by default until I know it won't blow up horribly) is bit-wise instead of nibble-wise, meaning that admins have better challenge granularity: https://anubis.techaro.lol/docs/admin/configuration/challeng...

What I'm hearing is that you spent a year designing a more complicated proof-of-work challenge rather than moving to a challenge system that actually impacts scrapers. Consider revisiting this decision!