"Bitcoin, Bittorrent, Skype" made me do a double take. Yes, they are cool, but it's some time ago they were the hotness. Especially Skype, which is touted as peer-to-peer but I don't think it is since many years ago.
It started out that way, though, which was very cool.
Slightly off-topic: I find async in python awful. The idea and concept is great, but the implementation of coloured functions in python is terrible. It remembers me of the "transition" from lists to iterators (mainly python2 to 3). Coloured function support should drastically improve (i.e. calling an async from non-async) in order to be accessible for newbies.
What should it do when you call an async function from non-async? Block?