Ignoring all the other things mentioned in comments, just assuming the simple case where Company B fully hires the employees. It's still an "advantage" for the

Ignoring all the other things mentioned in comments, just assuming the simple case where Company B fully hires the employees. It's still an "advantage" for the bosses, because if things go wrong you can close Company B without much impact on the business of Company A. They just create Company C and continue.