I've been firmly convinced for a while now that Sony purposely doesn't discourage jailbreakers too strongly. They quietly win loyalty by being just a little friendlier than Nintendo.

Odds are the Japanese leadership in charge of the hardware can't use a computer, so doesn't understand them.

Ref: https://www.pcmag.com/news/japans-cyber-security-minister-do...

There's a bunch of keys. Some are in mask rom, and would be incredibly expensive to make different per console.