If I hire Brad Pitt to be in my (post-pandemic) summer blockbuster film, part of the value he adds is that he is not simultaneously in your summer blockbuster film, and so people who really want to watch Brad Pitt will choose my film over yours.

I don't think what you're describing is anti-competitive behavior, rather it's omni-competitive. Pretty much all the money Google throws at anything is "advertising money" but if they are really trying to make self-driving cars, what's wrong with that?

Should my Brad Pitt Summer Blockbuster profits not be able to bankroll my Teletubbies Christmas Special?