Maybe not SBF specifically, because he seems to be too stupid to cut a deal, but the whole crypto space appears to be a den of thieves where secrets were poorly kept. I imagine that many players in his orbit knew at least generally what CZ and the other exchanges were up to.

Now that the feds seem to be giving a hoot about these scams, they shouldn't have much trouble flipping people and rolling up the chains to the bosses on the other exchanges too.