That's true, but Sony has been successful in making jailbreaking unfeasible for most people. The only path to a jailbroken PS4 today is to find one that's been sitting in a drawer without being updated for over 3 years, and even if you get that far there's no workaround for the version check on newer games so you can't play anything (legitimately or otherwise) that require firmware newer than the last exploitable version from 3 years ago, which rules out quite a few killer app exclusives.

Unlike past generations you can't just brute force it with hardware modifications either, the security is so deeply embedded in the SoC now that there's no way to touch it. Without a software exploit you're shit out of luck.

Yes. The talk was given by an xbox architect, and iirc he mentions he's not sure about the state of the PS4. It's a great talk and if you're interested in security you should give it a watch.

Do the jailbreaks let you play online with pirated games?

Yes. The problem though is as soon as the vulnerability used in the exploit becomes public Sony pushes out a patch.

That's not a problem at all.

None of the recent firmware have been cracked.

Yet

For 3 years. If it takes 3 years to crack and Sony can update in a few months (and force update or games won't run), cracks are uselss

Sony even managed to pre-emptively fix that last exploit a few months before it became known to the public, so users who were actively using their PS4 and allowing it to update unknowingly locked themselves out of jailbreaking before they had the chance. The prospects of jailbreaking the next gen consoles really aren't looking good given the PS4 was this much of a PITA and the Xbox One has been completely bulletproof for its entire life.