I think you and the GP are talking about two different things. Chrome’s early adoption on desktop was partly due to people finding it a faster browser, and partly users switching browsers without particularly thinking about it because they were exposed to incessant advertising for Chrome on Google properties. But Chrome definitely went to a whole new level of dominance with the rise of mobile, where a substantial number of people around the world use primarily Android phones for browsing, and thus they start off with the stock browser and never think to change it.