A great opportunity to make money, but I don't fully understand how high the price we can set for our services? Does someone control the price level?
Prices control demand! This is the basis of the market! Developers give you the possibility of unlimited earnings, but the efficiency of your earnings you build yourself!
Usually, start with low prices, which attracts people to call you. When you have collected enough customers, you can slightly raise the price.
This strategy works if you have chosen a fairly popular area. If you chose a specific area - then you can immediately put the price higher.