They aren't taking new sign ups. It's been like that across the entire merge network for a couple of years now. I guess their customer base is strong enough they don't need new customers or thie risks that come with them. They have a lot of books on the network (PlayersOnly, Sportsbook, Carbon and a few more) and they all have the same bonus so If you have an account with any of them you could get that bonus. If not you could try contacting support and ask them if there's a way to register or at least find out if they plan on opening up registration in the future. If you go to the contact link on the website there's a message system you can contact them through.