I suppose that's the real problem with these kind of issues; you see the same on e.g. YouTube where even fairly large channels acting in good faith can run in to problems. I don't think there's any malice involved, but it's just too much effort to fix, there are other things going on, and they've got enough money anyway: so why bother?
Even just a few years ago, Facebook's revenue was a lot smaller, so that would explain why they were more outgoing at the time.