Most of the services you use on the internet are centralized, but the internet itself isn't. Anyone can host a server anyone else can theoretically access so long as there is a path along which to connect and the user knows the address. Portions of the internet's infrastructure can be cut off from the rest by a sufficiently powerful entity, and most people use the same few DNS servers, but no one controls the whole thing. Internet 1.0 is still running under the surface.