The full part reads

Furthermore, we reserve the right to terminate the contractual relationship without notice for good cause. Such good cause is deemed to exist, among other reasons, if the Customer fails to meet its payment obligations or violates other important customer obligations. A further important reason which may result in us locking or terminating the Customer’s services or account without notice is if the Customer uses content that impairs the regular operating behavior or the security of our infrastructure or our product, or violates paragraphs 8.1. - 8.3. of these Terms and Conditions.