Its changed in the last year or so. Officially it started in October 2025, it's been a bit of a disaster in terms of implementation. It's called the Entry/Exit System (EES)

I've had my fingerprints taken every time I've been to the US, although not always all the fingers every time, presumably on subsequent visits if you have passport + right hand matches, they don't bother scanning left hand or thumbs.

I've certainly had the full scan on multiple occasions though.

Also good to know that EES is implemented by the private company Thales.