That's basically just part of the control to avoid the casino being abused. And yes, Metawin is a trusted casino; you can deposit to claim your bonus. We all know that they are quite new here, but you can see from their profile that they have been able to maintain a good reputation, as there's no negative feedback on the account, unlike other casinos that already have tags. Also, not many have had successful transfers recently as it has been paused due to some minor issues. So, keep that in mind and enjoy your stay with Metawin.