If possible, I'd ask admins or moderators to temporarily lock that thread with a note for lightlord that if he is active again, DM admins to unlock the thread.
If any poster want to discuss about it, create a discussion thread in Gambling discussion child board.
What? there's no difference if you ask moderators to lock the topic, but you're suggest user to create a new thread about Bitvest.io! Gambling discussion is mostly used for sports discussion or the game, not about the casino in general.
Anyway, there are a lot announcement thread on gambling board where the representatives are inactive, not only lightlord.
If you see someone is spamming, report to the moderators, if you're the campaign manager, kick him. We as an average user in this forum, can't do much because we don't have any power.