I understand you’re looking for a guide to free WiFi spots in Dübendorf, Netherlands.

Please note that Dübendorf is a municipality located in the canton of Zurich, Switzerland, not the Netherlands.

Due to the critical instruction to “Only use real, verifiable data” and “Never make up statistics, prices, or facts,” I cannot create a guide for free WiFi in a “Dübendorf, Netherlands” as such a location does not exist, and therefore, no real, verifiable data can be provided for it.

If you intended to request a guide for Dübendorf, Switzerland, or a general guide for finding free WiFi in typical European towns, please let me know, and I would be happy to assist within the specified constraints.