Well for one, you’re from Germany, so maybe you don’t appreciate certain types of satire, and they chose Chris rock based on his lengthy (Mainly successful) comedy career/acting. That has nothing to do with being embarrassing (You chose the wrong word to describe your thoughts it seems). Oh, After being 20 years in the business, I doubt he ‘needs’ to make an extra buck.
Years ago, Apple was using Selena Gomez to advert the iPhone 7, that certainly wouldn’t be construed as embarrassing, given she’s a vocalist.
Apple uses different figures in various industries all the time to promote the iPhone and other products, it’s nothing abnormal and certainly not ‘embarrassing‘.