It was impressive to have a direct support by using the telegram.But how shall we trust this gambling website.You need to start the official announcement of your project in this Bitcointalk.After using your website,the gamblers of bitcointalk will give their feedback on your thread.If your website feedback was good,your website will be used by most of the gamblers.
If the one who has a group or channel on Telegram is from a trusted and reputable casino, I certainly won't doubt it.
But unfortunately, out of all that, some casinos can't provide services like that trusted casino so having a group or channel on Telegram won't be useful at all.
But instead of having a channel on Telegram, those casinos should have an ANN on this Bitcointalk forum because they can introduce their casino to us and ask for help with suggestions, criticism, or anything so that their casino can develop better.
Apart from that, we have seen many casinos using the above methods to attract gamblers from this forum and most of them have succeeded in making their casinos grow big.