[daveheq]

How do we know what's in WireGuard?

[jkilpatr]

I'm not sure how to parse this question. So I'll answer both interpretations.

WireGuard itself is open source, our firmware and software is open source. So if the question is about encryption/software integrity go take a look.

If it's about what traffic is routed through WireGuard the answer is all user traffic to the internet, no exceptions.