It's basic supply and demand and it prevents shortages. If it's peak hour and I must get to a meeting and someone else is just going shopping, I would be willing to pay more so I am not late. I think the shopper is willing to pay less to go on the trip at a different time.
Supply and demand. Impossible to ignore. Either high demand leads to high prices or high demand leads to shortages if prices were constrained.
Since you said "you can keep that stuff in US," I have to ask: does supply and demand work differently in your country? It would seem, based of the state of many European economies (France, Italy, Spain, Greece, as examples,) that perhaps they need more of that free market competition "stuff" and much less government and taxes.
The argument "Uber has low prices because it pays badly, therefore it should be banned" is good. The argument "Uber is actually not cheaper and nobody cares about it, therefore it should be banned" is not.