This is good also I have been sceptical about telegram cryptocurrency wallet before now, but the development have being gaining popularity in recent time and to say that the casino have intergrate the telegram wallet to operate with the casino and this give their players an additional level of privacy and control over the funds.
@wallet is the Telegrams official wallet so I am sure there are no concern about security either. Besides there are nothing to skeptical, they launched their product on bitcointalk around in the last May, since then they are fairly active in the forum, spending a good amount of money in marketing too. As far as I know the marketing is not only on Bitcointalk but in some other advertising channels too. If the casino was not generating revenue then it was not possible to continue the marketing. We can conclude that so far they are doing good.