The computer
The internet
WTF? Calling a computer "decentralized" is like calling a washing machine "decentralized". THat statement makes no sense. Internet is not a "thing" -- it's just a name of a network, and for most people it's not decentralized, as they connect to internet via their ISP, and even most of the traffic on the internet (if not 99.9%) go through centralized servers like google, netflix, amazon. P2P traffic is mostly the file sharing software used by pirates.