How are NDAs enforced in closed beta?

I’m really excited about the start of the closed tests for Hunters Gathering and I wish the best to everyone who got an invitation, as well as success to the amazing development team.

But I do have a genuine question: how is confidentiality actually enforced to prevent leaks? I know there’s an NDA, but how do developers stop someone from just taking a photo with their phone? Are there technical measures beyond the legal agreements?