Offshore online gambling markets are hard to regulate. Regulators can use blocking to prevent access or financial transactions to unregulated gambling sites. But there is not much known about how well these strategies work. This scoping review found 14 publications focused mainly on blocking measures. The authors identified four main themes: implementation, effectiveness, risks, and alternatives. Overall, there is not much empirical research on the effectiveness of blocking measures. There is not much research on payment blocking in particular. The effectiveness of blocking measures depends on how they are implemented, particularly technically. The authors argue that more evidence with respect to the technical, legal, and commercial implications of blocking is needed.
