There are billions of people who uses mobile phones and tablets for their internet surfing needs. A huge number of those users uses an LTE wifi connection for their gadgets because it is one of the most affordable internet connections out there. Google seemed to have issues against people who uses this kind of connection because they force them to answer those irritating captcha tests. Many Mobile users converted to Bing because of it. Imagine if you worked hard to rank high with different SEO methods and sadly you lost some potential traffic because some people are now avoiding Google because they don't want to answer a captcha.