For me Google has stayed as the default interface, if I need to ask a basic query (probably searches that don't yield much revenue but keeps me on Google), the results were becoming worse a 1-3 years ago but now the AI parts of Google is now good-enough(TM) that I mostly don't need to go to a separate interface, as long as users aren't fleeing they can probably continue to get paid for ADs (also the if YT ads are included, those have really become obnoxious but probably well monetized).