It's fighting the culture war in the open, and virtue signalling at the same time. They don't want to be subtle and use subjects that lend themselves to filming with a diverse cast, or include a diverse cast in a way that doesn't clash with the source or the adaptation people are already familiar with. They don't even want to play it safe by making an all-black or all-Asian version of a story and presenting it as its own variation, to stand alongside the original (like The Wiz, or Brandy's Cinderella special). They need to very obviously break the old version and rewrite/reshape it in their own way.
It's not, or not only, about breaking even. If it was all about making money, they would consider the international market, China in particular, where blacks are not at all popular.
It's basically violently raping Western culture into submission and they want those discussions about obviously unsuitable casting choices as long as it's necessary to drive home the lesson that multicultural mix good, desire for homogenity bad and totally Nazi (also, we have always been at war with Eurasia). They keep doing it to spite and to fight the backlash on woke,