You dont seems to understand the main point. The main point is to send promotional emails daily but most people dislike promotional emails so freebitco.in came up with a 'brilliant idea' ( WoF ) that would allow them to keep on sending emails daily.

Its simply like giving choices for the customer, if they want free WoF spins then they need to allow freebitco.in to send the promotional emails. If customers hate it then simply choose not to allow it but in return there will be no free WoF spins. Its either you take it along with those emails or leave it, its simple though