Cryptex

I am not a lawyer, but can't you just shut up? The FBI comes by asking questions, you can tell them "I will not answer any questions.", and, depending on the general mood, because not all FBI agents are nice people that will understand what you're doing, you can probably further say "If you have grounds to arrest me, I will want an attorney present for all interactions".

As far as I am aware, you do not have to answer them if they question you. This might frustrate the FBI however, and different agents will likely respond in different ways.

Are they okay with it? Apple has always seemed like the type of company that wouldn't want to dilute the "Apple Experience". I'm quite impressed they're aware of it and haven't asked you to shut it down. Kudos.

Indeed they do. And not all of them have the benefit of being able to justify themselves with "I leaked this for the good of the country".

It's not all that rare to see sysadmins that get fired or even just perceive mistreatment by coworkers or employers to jump the shark and mess up the systems they're meant to take care of.