Only thing I dont understand is why are they keeping this telegram group alive when there is no activity at all.
Maybe they are planning to rename it in future with some different casino project name and they want to keep number of followers higher than starting from zero.
You can sell a telegram group channel but I dont think thats their intention. There is no reason for them to shut the group down as there is no merit to that and by keeping the channel they are giving that glimmer of 'hope' for people to believe that the site is going to come back. Personally I think they are gone but some people still have that glimmer of hope