For every product or brand there's a group of primary consumers, and multiple groups of secondary consumers with ever-decreasing personal interest and/or leverage on primary consumers.

It's nonsensical to suggest these groups can be equal or equivalent.

And it's not unusual for misguided celebs to damage their own brands through unfortunate endorsement deals, and for brands to have their influence damaged after picking the wrong celeb to endorse.

Advertising is powerful, but it's not infinitely plastic. Beyond a certain narrative stress point the power to persuade breaks down.