They shouldn't. At least if they follow their own rules. They cracked down heavily on sites (like experts-exchange.com) who would display results and answers to GoogleBot, but when humans attempted to browse that page, they had to register/ pay to see the same page.

That's known as cloaking. user agent sniffing is never a very good idea from SEO perspective. googlebot also uses normal browser user agent and if it finds that you are returning different content based on user agent then your site can be in trouble.