They do not have a CLA, and they accepted code from other contributors. Hopefully the rewrite removed all code from third parties.
Debian does not seem to have this in their repositories.
I urge users to fork the last open version. Do not contribute to a proprietary codebase for free.
Surely, users of software aimed at media piracy will be unwilling to disregard software licenses.
It seems HN hides the # segment after the URL.
Here's the LICENSE change: https://github.com/ThaUnknown/miru/compare/v6.1.0...v6.3.7#d...
They rewrote the entire commit history so there isn't a specific commit history where the license was changed