I wonder how much Google pays PC manufacturers to have Chrome as the default browser. A few years ago I purchased a Lenovo laptop that had Chrome pre-installed as the default. The desktop shortcut label was simply "Internet Browser".
Back in 2012 when they were still pushing chrome market share it was $.50-$5 depending on product and manufacturer
Google easily makes the money back over time. A PC is used for many years over which Google shows those consumers tens of thousands of ads, easily worth more than the unit cost of a default browser deal.