How's opsec going to help against a rat anyway? If an insider gives out information, you're toast anyway, unless you have some kind of a cell network going on like some terrorist organizations and that's, uh, a bit too much for organizing an union

I don't see how it's some advanced technical process. It all comes down to the quandary of who to trust. If you don't trust enough people, you don't grow the movement. In this case, all it took was one figure to whom they overextended how much trust he was worth.

Seeing more governments salivating over chat control and banning VPNs, some even actively implementing these, I really dont't think we're seeing OPSEC being taught in schools or colleges.

They used to tell us to be careful around the Internet, don't use real names or give addresses or phone numbers or share any of our personal information online, to be cautios, to beware... now it's all about "You dont't have to worry if you don't have anything to hide" and giving away all of your data voluntarily or being denied service until you do (or at least getting worse or more expensive service) and age verification.

I was taught in Elementary/Kindergarten.
I had the privilege of being taught information security, programming, and OPSEC in a private school that no longer exists.
See you at school board meetings.