Here's the gist doing side-by-side comparison (from Fairscan author)

https://gist.github.com/pynicolas/e018ef84464a2cf7949fa453e41cfead#code-comparison

I didn't check it all but it looks like their should be attribution for this to Fairscan, both publicly and in the repo.

Ente's repository has a single license file at the root and not much else so their licensing seems pretty lightweight, maybe that's all they needed so far.

REUSE makes it easier to attribute per file where neccessary:

https://reuse.readthedocs.io/en/stable/readme.html

Would be nice if ente would at least reply in some way.