You can look at how much electricity they need, because you need a certain amount of electricity to run the servers, and Google is more efficient than most, but they still have some basic requirements, and that lets you put a limit on the number of servers that they have.
Te poți uita la cât curent consumă, pentru că e nevoie de electricitate ca serverele să funcţioneze, iar Google e foarte eficient, dar tot au cerinţe de bază, care îţi permit să găseşti numărul limită de servere pe care le au.