It's a bit like the Easter Islanders cutting down all of their trees for wood. Where does Google management think they'll get search results if they kill the entire internet? Has anyone at Google thought that far ahead?
The internet they dream of is like a large mall. It consists of service providers selling you something, and Google directing you to them in exchange for some of the profit. The role of users in this model is that of a Piñata that everyone hits on to drop some money.
DDG is just serving you remixed bing and yandex results. There’s basically no alternative to GBY that do their own crawling and maintain their own index.
I've been using noai.duckduckgo.com for a few weeks now and it's pretty reliable. Still yandex etc. but at least no longer AI overview. (Yes, I know about settings, but they get deleted every restart).
The reality is, every time someone's search is satisfied by an organic result is lost revenue for Google.