I've seen quite a few bitcoin giveaways in the past from gambling sites that seem to have stayed where they were so it's probably fine.

It might be worth looking at if there's a different way you could do it because a bump every few minutes (for example) might drown out anything useful on that board and if it gets too much the mods might react to it. I also can't remember if those posts were in the games and rounds or in micro earnings also.