Which is the stupidest position ever if Google wants to exist long term.

Unfortunately there are no workable alternatives. DDG is somehow not better, though I use it to avoid trackers.

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?

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.