This $1,699 “secure PC” will self-destruct if tampered with

Exponential delay is a much better model than outright denial of service. Take Unix passwords: if you keep making mistakes, the prompt might start waiting several seconds to give you another try but you do eventually get another try.

Nothing frustrates me more than needing to log in to something and having it “locked out” for a stupid typo (bonus points if I can only unlock it by calling some stupid wait-20-minutes support line that is only open Monday-Friday 8-4).

Where's the kaboom? There was supposed to be an earth-shattering kaboom.