Your obligation, our obligation
If you do not submit the requested data within the specified time limit, it may cost you money. The Dutch government has decided to take this measure because your data are considered to be very valuable; in fact, so valuable that it has made submission of the data enforceable by law. This has been laid down in the Statistics Netherlands Act (The requested page isn't available in English). This Act also stipulates that Statistics Netherlands must make every effort to obtain data from other organisations first, for example the Dutch tax authorities. However, if these organisations do not have (sufficient) data available, then Statistics Netherlands is allowed to impose the requirement on companies to submit their data.
More information can be found in this downloadable brochure (The requested page isn't available in English).