Cryptobull is a lot available exchange with little information. This site is pretty difficult to trust in as it does not bring access to programs of trading and has not been recognized by traders. Even when it was proved by advanced merchants, the site remains inoperative and has not received support from its developers. The current access to the main page is not granted, and it is not possible to access to it through a VPN.
I recommend users to stay away from this page an wait just for official releases from the company. They must inform of what happened to the project and if it's going to be recovered. For now, users must be aware that this site might be a real scam as it is full of negative aspects.
I invite you to read the little information that there exist about it in the CoinMarketCap as this is the only official network that we can trust in to check the status of a page for trading and all events happening in the crypto-world.