For many years, the worlds of marketing, advertising, and digital marketing were designed by and for one particular audience: the "standard" middle/upper-middle class, white nuclear family. There is still much work to be done to uplift BIPOC voices, so follow these BIPOC-owned creative and marketing agencies to support those that are sharing multicultural and minority stories.
It's not that other communities did not exist or buy products, it's just that their voices, opinions, and cultures were suppressed.
While still not completely equitable, beliefs are changing and many BIPOC people are now being heard and represented in media and business.