I’m not entirely sure what you hope to achieve: have a GPG encrypted subject, and have ThunderBird automatically understand that it’s encrypted, so it can be automatically decrypted?
Since you’re saying you’re building software to support this, what are you building? A ThunderBird plugin that can do this? Or just standalone software that you want to make compatible with ThunderBird default way of handling encryption?
Although I agree with the sentiment - the article mentions that it’s “only” regarding about 1 mil people. (Probably South Korean users)
So it’s still a $15 fine per violation. Could have been much higher, sure, but I don’t know if that’s a good return of investment for Facebook.
Maybe this case sets an example for other countries or regulatory bodies to start issuing fines to Facebook as well