The problem with all these P2P approaches is that they work sometimes, or barely. Aforementioned file.pizza can't even send me a file between my laptop and desk

The problem with all these P2P approaches is that they work sometimes, or barely. Aforementioned file.pizza can't even send me a file between my laptop and desktop, both being behind the same NAT. EDIT: Well what do I know, it worked today, but hasn't a few weeks ago when I first heard of it. The transfer speed however makes it seem like it's actually pushing it through the entire internet, it's flying at about 500kB/s.