> Really enjoying the picture of this user who logs into his router and decides that all unsolicited network traffic from the internet should go to his network camera. Absolute legend. God amongst men.

If that idea surprises you then you definitely need to touch grass. Even cloud computing engineers are surprised to see random internet requests hitting services,and here you are assuming that any regular consumer that just wants a security camera to work will somehow have deep understanding of networking and DevSecOps and trying to ridicule those who don't.