I do have to say it's really odd how they have to go through these protocols for a "free" contest in which you can win a digital prize. The only thing I can conclude is that since you pay a monthly fee for this game there's a law that states that setting up these contest may entice people to pay for your services and hence form some sort of illegal gambling according to their laws.

These contest aren't as simple as "no purchase is necessary" since you do have to make a purchase in order to be eligible for these contest which is prolly where the issue lies.