The real reason is because women are insane herd animals.

First, they brainwash white women into thinking being with nigs/etc is socially desirable.
Women believe this - the problem is that they are not into bestiality and prefer white men. Thus makes it hard for them to achieve the social ideal that has been programmed into them.
To resolve this, women must try and burnish their image to include mixed-race couples. Thusly they virtue signal and copy black styles and pretend to love beyonce and generally glom-on to anything that makes them appear closer to the social ideal.

Advertisers understand this and realize that they can attract white women customers to their brand by wrapping it in this imagery.

It’s all one big cope that reveals the truth we all know - white women are the most race loyal of all people.