They don't... my take is it's just a fiction made up by someone trying to promote a distro.

thanks for the clarification.

There's interest because of a recent, popular post: https://news.ycombinator.com/item?id=12830761

As to how many people really are migrating, who knows. I'm an Apple user, but I'm not going to take the rabid fanboy position that these distro makers must be lying when they say they've noticed more interest, lately.