I ran into quite a serious issue with NetGuard. While I was in a TeamViewer session, NetGuard lock-down was enabled and after a few seconds the TeamViewer session continued when it shouldn't of had any internet access whats so ever.

With this being said, I ran multiple tests and found that sometimes the internet will bleed threw even if NetGuard is on. Imagine what other privacy invasions could be happening from other applications if NetGuard isn't doing its job correctly.