Most exploits used in a jailbreak are developed only after a public patch for the underlying bugs appears. Once the patch is publicly available, an exploit has

Most exploits used in a jailbreak are developed only after a public patch for the underlying bugs appears. Once the patch is publicly available, an exploit has much less commercial value. (Attackers don’t like having to call their target and tell them not to apply the patch.) It therefore makes sense to donate such exploits for a jailbreak.