Exposing the exploit out into the wild, telling every blackhat in the world, leaving millions vulnerable.
But of course, having the exploit known to themselves for months, they have a patch ready from the get go when they announced their jailbreak.
Too bad for the millions of people who don't want to go through the trouble of jail-breaking and all the hassles/potential problems that come with it.
Logic clearly dictates that the needs of the few outweigh the needs of the many.
Especially when the "needs" of the few are purely just for their amusement and the needs of the many involve not getting their phones hacked and personal data stolen.
/s