You're moving the goalposts here. I'm not talking about marketing products to different groups (presumably in Nigeria they use all African actors, and in China they use Chinese ones), nor Disney making a movie based on Mexican folklore, nor the mere appearance of minorities in reasonable numbers or in appropriate contexts. Nike has been heavily featuring black sports stars in its ads since the 1980s, and Morgan Freeman played the President way back in 1998.
What's new, in the last 5-10 years, is the industrial-scale practice of shoving nonwhites (which mainly means blacks) to front & center in media depictions in White nations, regardless of whether such depictions make sense. So you end up with blacks appearing in 30-50% of ads in markets where there are few blacks to be found, and TV series race-swapping Africans into 17th century London. This is done for propaganda purposes, or to comply with leftist religious scripture.
Don't believe me? Search for "happy white woman" on Google image search. A good third of the images feature blacks, often a black male who is clearly supposed to be the sexual partner. Do the same search on Qwant or even Bing and you get... pictures of white women, funny that.
Your claim that it's all "just a business decision" is easily disproven by the fact that diversity mandates exist in the first place. Hollywood, for instance, had to establish this elaborate quota system and diversity-commissariat bureaucracy precisely because commercial incentives weren't yielding the results demanded by Woke theology.
This is all speculation.
But if your outrage is minorities portraying white historical figures let me just give the best example of how much business sense it makes. The play Hamilton. Totally blew broadway revenue out of the water. Nothing was ever close per ticket sales. Even the second cast continues strong. It sold everything.