The most common reason to cancel a subscription is to save money. The average consumer has so many subscriptions that this can lead to considerable monthly costs. Especially when you calculate how much a subscription costs on an annual basis, many consumers are shocked and immediately start cancelling expensive, unused and/or useless subscriptions.
Do you want Stichting De Hond Kan De Was Doen to delete your data or at least not contact you any more? Then you can use your Right of Objection or invoke the AVG and ask Stichting De Hond Kan De Was Doen to remove your data from their files. This way, you can be sure that you will no longer be approached by Stichting De Hond Kan De Was Doen to take out a new subscription.