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I think what you refer to as decentralized systems is for the most part applications on top of the TCP/IP protocol stack. Still I wouldn't call the examples you provided - with the exception of torrents - as decentralized. The internet and the telephone systems are mostly run by a few large ISPs and CDNs, email by a few large providers (Gmail, Yahoo, Outlook), and for most people the web consists of Facebook, Youtube, Spotify, Instagram, etc and a few large newspaper sites.

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