Why would I use this instead of other alternatives?
also, the name is misleading, the project is not made by Klarna
also, the name is misleading, the project is not made by Klarna
"Despite the "Klarna" mention, this repository is not affiliated with Klarna AB. KATT was indeed born at Klarna, and Klarna AB holds copyright for parts of the code, but it is now being maintained outside the company, by its original authors and new contributors."
Do they have a permission to redistribute the code?
This all feels legally complicated
The License and notice files appear to be sufficient to understand the situation and there's really not a lot going on. The licensing files indicate that Klarna AB holds copyrights in the code (with some others mentioned) and that it is all licensed under Apache 2.0.
Naturally, the license related files in the repo can be inaccurate or incomplete. But when dealing with open source software you have to pick a point where you're going to trust these kinds of representations from strangers.