I wouldn't count moa extinction as a natural one. It lived up to historic times, a few hundred years ago, and is well established humans had a big role in their demise. The jury is still open on other megafauna that went extinct thousands of years ago.

I'm write an entusiast for efforts to use modern technology to reverse some of the damage we've done to Earth biosphere, even recovering lost species. But the dire wolf shenanigans made me skeptical of Colossal. At this point it appears more an elaborate publicity stunt than legitimate de-extinction effort.