Good point!)
Do you think it could be fixed by a procedure like that: the neural network can be updated by a vote of a governing body of people, that drivers and passengers trust? How to form this body then ? Should there be some kind of a token for that?
Imho governance is a huge question - I was born in a country (USSR) which tried a communistic experiment - it failed profoundly ! In the USSR taxi drivers were taking advantage of passengers in all possible ways, in addition to that they were stealing gas all the time 
A simplistic approach, where you pass all the power to the drivers will probably fail, you need to take into account both the drivers and the passengers somehow, the question is, is there a sustainable governance model to do it?