What are these suspicious gvt1.com domains?

What are these suspicious gvt1.com domains?

3 years ago
Anonymous $hYN7Hy7o7J

https://www.bleepingcomputer.com/news/security/what-are-these-suspicious-google-gvt1com-urls/

Certain Google-owned domains have caused Chrome users, from even the most skilled researchers to regular users, to question whether they are malicious.

The domains I am referring to are redirector.gvt1.com and gvt1/gvt2 subdomains that have spun many questions on the internet.