The best kind of content for engagement is hate. You get users angrily defending both sides, stacks of comments, reposts (both in support of, and "OMG look at what they’re saying), the whole shebang.

Meta has learned that promotion of hate content pays off handsomely on those sweet sweet engagement metrics that shareholders love.

So of course they’re going to pay the hatemongers for content. Even when their own content policies ostensibly forbid it. Because that’s what makes line go up and they’ll do anything to keep that happening.