Much software is not ad supported web sites.

Much of my web experience is broken by default due to blocking Google or occasionally Microsoft ad analytic data. Many flows expect these to load even if it is not necessary for the functioning of the site. Many other sites break just due to strict enforcement of anti-cross-site tracking.

I'm not just talking about ad supported sites, although I guess you could say that Google Drive is indirectly ad supported.

Since I do most of my ad blocking at the network layer rather than in my browser, it's not always obvious to me as the user whether it was a "my blocking broke the site" error or a "The site is broken" error.