Some did. Some people moved to Chrome because they saw ads for it everywhere. Some moved to Chrome because it was bundled with something else they installed (

Some did. Some people moved to Chrome because they saw ads for it everywhere. Some moved to Chrome because it was bundled with something else they installed (e.g. Flash, Acrobat Reader), with the "make it the default browser checkbox" pre-checked by default. Google spent a fair amount of money for a few years on marketing and paying all sorts of other software to bundle Chrome as an opt-out.