The problem here is that when Joe Sixpack buys a Windows PC and starts it up, there is no "Google ball" on the taskbar: there's an icon for Edge, Microsoft's own browser that's included in Windows. Chrome is nowhere to be found. Joe only sees Chrome when he goes to a Google site like YouTube and gets prompted to install it, and goes through the steps of doing so. Joe could just as easily install Firefox, but he doesn't, perhaps because no huge website like YouTube is encouraging him to.