> Edit: Although as yeldarb explains in a comment here[3],
> it's probably a bit more complicated than that.
Legally speaking I'm not sure anything wrong was really done here.
Morally speaking, it seems quite unethical. AlexeyAB has really been carrying the torch of the Darknet framework and the YOLO neural network for quite some time (with pjreddie effectively handing it over to him).
AlexeyAB has been providing support on pjreddie's abandoned repository (e.g. [1]) and actively working on improvements in a fork [2]. If you look at the contributors graphs, he really has been keeping the project alive [3] (vs Darknet by pjreddie [4]).
Probably the worse part in my opinion is that they have also seemingly bypassed the open source nature of the project. This is quite damning.
[1] https://github.com/pjreddie/darknet/issues/1900
[2] https://github.com/AlexeyAB/darknet
[3] https://github.com/AlexeyAB/darknet/graphs/contributors
[4] https://github.com/pjreddie/darknet/graphs/contributors