The development of Sichuan cuisine is inseparable from the promotion of Sichuan cuisine by chefs. One of the reasons why Sichuan cuisine has developed to this point is that it tastes better and everyone likes to eat it. Moreover, the taste of Sichuan cuisine is relatively heavy, which can stimulate people's taste buds. So a person thinks Sichuan food is delicious, and then he will take his friends. This will naturally become more famous over and over again.
However, Shandong restaurant is not very famous because of its small audience. I've met many Shandong people, and he likes Sichuan food more himself. It's strange to say, because he is from Shandong, he is tired of eating Shandong food. When I go to other cities, I definitely don't want to order Shandong food, but I want to order Sichuan food. Imagine that the development of Sichuan cuisine is inseparable not only from the efforts of people in Sichuan and Chongqing, but also from the efforts of people all over the country. Naturally, there will be more Sichuan restaurants in the streets and lanes, and the same Shandong restaurants will be less.
To sum up, I think you can see Sichuan restaurants everywhere, but the reason why you seldom see Shandong restaurants is that Sichuan cuisine is delicious. Moreover, the audience of Sichuan cuisine will be more extensive, and Shandong cuisine is only in line with the tastes of a small number of people, so the market of Shandong cuisine is not as big as Sichuan cuisine.