If users want to remain safe and feel that they are not losing the time, they, they must know that cost-coin is another financial project that anyone knows how it uses to work because it is now abandoned. Accessing to be web page is just a sign of being rejected since it is not available, and it shows a smart chart with a common error. Outside the platform, there is no information related to the features of this project, or at least a way of contacting the team.
The official markets have already mentioned that this platform is out of service and that it hasn't provided anything positive to the ecosystem. There is little content to know about the max-supply of the token, but there is enough information to know that it did not has a volume of trading.
There were users on the page who invested a little on it. There is no proof to certify they still have assets on the platform. All I suggest for current users reading about it is to keep away from that platform to avoid any possible problem.