The Dutch Data Protection Authority fined the tennis association for selling the personal data of more than 350,000 association members to sponsors. These sponsors then contacted some of the members by mail and telephone for marketing purposes. The Authority rejected the tennis association’s argument that it had a legitimate business interest in selling the information.

https://autoriteitpersoonsgegevens.nl/sites/default/files/atoms/files/boetebesluit_knltb.pdf