We have such "lego block" website builders in Germany since $forever, and while with some experience you can easily tell which builder (and therefore hoster) any restaurant or hairdresser used for their site, it's good enough for their purpose: get the word out there, announce their services and opening times, have something to point at from Maps.
There's also a chrome extension called Wappalyzer that can help you determine what was used to build the sites if its something you check often. Works pretty well in my experience.
