Google blocks ads from their competitors. [1] In the article, they state it’s because those companies are not following their standard, and are using too many resources. (Which they claim negatively impact device performance through metrics like battery performance)

In comparison, Microsoft implied in their advertisement that their browser is safer than Google’s because it has the “trust of Microsoft.”

[1] https://blog.chromium.org/2020/05/resource-heavy-ads-in-chro...