The whole BoP thing was Robbie's vanity project. It would've turned out the same way had it been made in the [current year].
Those are the Gotham City Sirens. The BoP are these:
But these days, they look like this:
You'll notice that these days, Latinas are BLACK. Asians? They're BLACK too. And Italians? They of course are ******* BLACK! What, you think they're ****ing Euros or some ****?! Hell, I'm getting BLACKER this very second! Everyone's ****ing BLACK!
Yeah, I seem to recall in comics the BOP ten years ago seemed like they pretty much mostly white. My guess is that a lot of studios are afraid to show majority white faces, and even if they are white, there's a heavy street look or mixed-race vibe to cover themselves. Studios may control billions but they are running scared most of the time.
Social media drives it - all it takes is a few thousand people globally (out of the tens of millions of targeted audience) to come up with some hashtag about not embracing diversity in some way and a project can lose tens of millions (hell, even mundane stuff like Democratic Caucuses/primaries are suddenly super-racist.)