Dutch gambling regulator de Kansspelautoriteit (KSA) has written to more than 50 affiliate sites active in the country to remind them of the laws regarding the advertising of online gambling.

The KSA said it recognised that gambling operators often use affiliate websites to advertise their offering, with users able to click banner adverts or links in text to visit sites.

However, the KSA said that this method does not always comply with advertising rules in the Netherlands and wrote to affiliates urging them to ensure their websites are compliant with national law.

In the letter, the KSA said affiliates may only advertise gambling sites run by operators that hold a licence to offer online games of chance in the country.