You don't need to punch through a NAT when you have a bounce server. Both sides are already connected to the bounce server and all interaction between those pee

You don't need to punch through a NAT when you have a bounce server. Both sides are already connected to the bounce server and all interaction between those peers is done through the bounce server. Thus, the peers don't need to communicate directly... so you don't need to do any NAT punching. That's what makes this method simple... with the downside that you need a publicly exposed intermediary. But it is vastly simpler to setup than STUN.