One simple way to thwart robots is to frequently change a website's layout by, say, moving price information to a different place on the screen, so that a "bot" programmed for the original layout can't find it.

FORBES: Magazine Article

So instead of designing many different mobile experiences for every screen size out there, one website with its core set of HTML pages can automatically adjust its layout to display optimally on desktops, laptops, tablets and mobile phones.

FORBES: How to Dial Up Mobile SEO

Not only the layout but also the actual content that it is served on the desktop and mobile versions of the website is very different.

FORBES: How to Dial Up Mobile SEO