The sad reality is that black hats have been exploiting this class of bugs for years.
I would be happy to apologise if you could find one example of exploitation prior to a few days ago when it became public.
Take my word for it when I say there are upper echelons of black hats that are stockpiling unknown 0-day exploits like this and presently using them in the wild.
Or dismiss me as irrational and continue with the belief that all bugs are unknown until white hats share them with Apple.