The courts found against google in the huge search engine and online add cases, https://www.theverge.com/23869483/us-v-google-search-antitrust-case-updates finding that Google is a monopolist.

They may force Google to divest Chrome. That probably had some impact on this offer.

https://www.theverge.com/news/626502/trump-doj-recommends-google-breakup-antitrust-search-chrome

Of course, chrome is Google's primary useruseage tracking tool, so that would be a big blow for them. They'd have to buy the data they now generate themselves.