It makes more sense with restaurant reviews. The business environment is so intensely competitive that any restaurant actually deserving of 1-2 stars would be much more likely to eventually go out of business.

So, over a long enough period of time, you’d wind up with mostly 3-5 star places, with some exceptions existing for restaurants that can survive without the benefit of repeat customers. (tourist trap places, places operated as some kind of money laundering operation, etc)