In the current day and age nearly, everybody has a smart phone, but it wasn’t always this way. In the early to late 2000s smart phones barely existed and nearly everybody was in possession of an analog cell phone. At this point in time websites were only viewable using a desktop computer which wasn’t entirely a bad thing at the time but if you compare it to nowadays where almost everybody is in possession of a smart phone. Most websites older than the last couple of years are probably not optimized to be mobile friendly which affects the number of potential customers to said website.
There is however a difference between a mobile friendly website and a responsive one. A mobile friendly website is one that functions on every device however it appears the same way on every device that it would on a computer.
Mobile traffic takes up 52.64% of the total global traffic as of 2017 and are predicted to reach 79% of global internet use by the end of 2018
On April 21st, 2015 google updated its algorithms boosting the rankings of websites deemed mobile friendly by google, this was to be named by google as Mobilegeddon. So as it turns out google likes mobile friendly websites.