[YouTube] The Guardian investigates why many good restaurants are invisibile on Google Maps.
Officially, the algorithm uses relevance (what you searched), proximity (distance from you) and prominence (good reviews).
In practice, it also favours restaurants with a website and mentions on other websites + restaurant owner having a Business Profile acount → good restaurants that do not make a lot a publicity will not be shown.
Established restaurants are advantaged (Matthew effect).
Also, because of the limited cuisine types + language bias towards English-speaking reviews, original restaurants are penalised → standardisation of what the consumer is shown.