is Rigging and animating all characters in UE5 for free (MIT) legal?

Hello,

Kind of a click baity title but my questions are:

1. Is there a resource where many characters in Mixamo were already animated and rigged and work Unrea; Engine?

2. I suppose there isn't. If so, is it legal to do this and post it for free for people to use? 

Because on the one hand Mixamo made all the animation and characters assets but since so many use them I wonder why there isn't already a pre-made bundle or marketplace content with these charcters and animations intergrated into Unreal Engine...Of course it can only happen under MIT license and non-profit in any way.

Thanks!

Thanks!