Isn't everything allowed in Gambling as long as its main topic is websites that want to promote their gambling site? If its a site that promotes gambling using altcoin then I suppose it's free to do so but if it is topics about altcoin discussion itself, then they should proceed to the altcoin discussion part of the forum.
Not all gambling sites are allowed in the gambling section.If you see one that only accepts altcoins you should report it i've been reporting these kind of threads before they're usually marked as good and will be moved to service announcement (altcoin).
