In this way, Google gets all the value from Internet properties they don't own without having to push any traffic to those sources. So, they get their cake and eat it too. They create a way to regurgitate information from the vast trove of info on the Internet without ever having to share traffic with those sources by moving traffic from their search engines to those sites, like they do now.
They get to sell advertising to those who want to capture eyeballs for search results, without having to share any ad revenue with the content providers that are powering that transformer-based search.
Ain't it grand?