I’ve never heard of it, it could be an unprecedented and infamous method of advertising or getting gamblers to gamble with them or perhaps get scammed but, I don’t like it. Having to put gamblers in a position of doubt, where they have to question themselves on if they executed such actions or not doesn’t speak well of them.

If I were you, I’ll just have to ignore them and move ahead with my activities. They could clearly be what you suspect and better still, your well grounded in gambling to not jump into conclusions in agreement with their plans.