What is the point in fining him 100 euro, you need to make it a good fine to put off other chancers from doing a job they have no right to do.
If I had my way he would have been fined the maximum 5000 euro, same as all the other losers who operate an unlicensed taxi service, and that is exactly what they usually are from my experience, and they attract the same kind of people to their illegal taxi business, alcos and wasters.