€100M for not allowing the EnelX app (electric car charging infrastructure in Italy) with Android Auto is a significant fine. Even if €100M on its own is not much to Google, it is still an expensive precedent for similar cases in the future.
(And in the same spirit, precedence can be overridden relatively easily in a common law system, too, the judge just has to find an obscure aspect of the new case that allows her to argue that the old cases don't apply.)