A more likely reason is that Google and other internet companies see internet infrastructure as an economic complement: the better and cheaper the internet is,

A more likely reason is that Google and other internet companies see internet infrastructure as an economic complement: the better and cheaper the internet is, the better and cheaper the total internet + Google services package is. That's why they do so much web performance advocacy, make their own browser, keep trying to kill off ISPs etc. Every dollar you spend on internet service is a dollar you don't spend on digital subscriptions, and every second you spend waiting for pages to load is a second you're not consuming content and watching ads.