A friend is writing a business plan for an assignment in her business school. The plan has some formal requirements, e.g. you need a logo for your planned company.
The friend prompted some "AI" for the logo and had it done in an instant, so now she's super happy she didn't have to spent a whole day on a placeholder.
The logo she got is the most generic you could imagine. Good for a placeholder, and not much else.
So that's a valid use case for AI. Placeholders.