Avoid commercial sites by adding your own flavor of top level domain (TLD) limitations, e.g. "(site:.org OR site:.net OR site:*.edu))"
For example: instead of returning the top result on ahrefs.com, this query:
- 'search operators "site" (site:.org OR site:.net OR site:*.edu))' makes it easier to find: "https://guides.lib.berkeley.edu/GoogleTips" in what would be a sea of SEO gamed results on .com domains.
Reference:
Cook has gone so far as to call for tighter regulations on explicit user data sales, so likely not much there. Maybe in its ad platform aggregated data might be used.
The closest thing in that regard I could find was their mention of advertising sales in their quarterly report. Likely user data in some aggregated form is sold to sellers, like FB does
Here is one snippet on their ad efforts (from an unlinkable ad cancer adweek site):