UberPOP, which has already been smacked down in Belgium, France, Germany, and Spain, connects passengers to private-hire drivers. That's a no-no, contravening laws dealing with interactions with commercial drivers. A judge in The Netherlands ordered the service shut down but Uber continued to run it, hence two visits from the authorities in the span of a week to remove computers and figure out how blatant Uber has been about ignoring the judicial decree.
The court had threatened a 100,000-euro fine if the company didn't fall into line. Uber says it's cooperating with the investigation, but it's clear that the threat of a lower-six-figure fine isn't enough to get it to cooperate with the courts.