I’m really dismayed by your political system - I can’t put into words how much it disturbs me. I know it’s a good thing that the Harris Walz campaign is doing well, but all I hear when seeing news like this is how much money politicians are taking from “average” people to give to insanely rich advertising firms, to develop ads, and even more insanely rich media corporations, to run them. It’s messed up.
Once an end-to-end, encrypted, connection is established between a pair of peers then anything can be sent through it. The establishment proces is generally facilitated by a server of some description so neither peer needs to allow inbound connections. (I’m a long, long way from being an expert on this and happy to be corrected - but this seems like network fundamentals?)