The competitor is fined because it is their responsibility to make sure that they use the right parts. The manufacturer is not responsible. If the team had checked and returned the part there would be no issue. In this case the fine is much better than Exclusion, which is what could have happened. The rules are made by FIA, and the competitor has to abide by them, and the Stewards enforce them. Andreucci drove a great rally, and was very lucky to have a result recorded.