It's one factor among several. Another large factor is that Chrome was easier to deploy and manage in a corporate environment for many years. Really until Edge came out a whole lot of people had it foisted on them via their IT department at work, I'm sure many still do but Edge has definitely changed things and made that less common since it gets included with the OS. Combined with Google constantly pushing it everywhere these workers were guaranteed to encounter the option to download it at home even if they didn't explicitly seek it out, and since they already used it at work it wasn't a scary download it was familiar and made by that great company Google that everyone is so impressed by. They click the download and that's that, they don't even know Firefox is an option.