Keep in mind it is only google. Trump has been developing his comms channels for a decade with a core base composed of people who hate 'the media' in every form. And he has gotten pretty good at using those channels. It's also the case that everyone has heard of him now (you may recall that he was recently The President).

Harris was put into candidacy at the last second and needs to speedrun building a president's worth of goodwill from scratch against a guy who functionally already has it. That means her marketing base is 'the entire country' and you need to hit that as hard as possible as fast as possible, which is expensive.