".... At first, most users would run network nodes, but as the network grows beyond a certain point, it would be left more and more to specialists with server farms of specialized hardware. A server farm would only need to have one node on the network and the rest of the LAN connects with that one node".

Bitcoin P2P e-cash paper
Satoshi Nakamoto satoshi at vistomail.com
Sun Nov 2 2008

https://www.metzdowd.com/pipermail/cryptography/2008-November/014815.html