That's a lie. It doesn't do that.
I think I'm fairly computer savvy, but had I not searched on how to bypass this, I probably would have set up an MS account. For "normal" people, I'd say this will be extremely effective at increasing their "conversion" to Microsoft Accounts.
It's extremely hostile.
[1] http://news.softpedia.com/news/Windows-8-1-Preview-Won-t-Sup... (This isn't the article I read back then, but it's the first thing I found when I just searched.)