When Google search first appeared it was miles ahead of the pack. There was no alternative worth using. They had a true monopoly insofar as nobody was able to compete.
Nowadays, if Google Search were to disappear, I would hardly notice. That would have been unthinkable 20 years ago. The alternatives to Google got better, and Google itself got a lot worse.
They still have the numbers but they don't have the product anymore and they're just juicing it until the end.