It's my first time hearing that Telegram also operates casinos and I haven't personally tried Telegram casinos. I only have seen prediction groups on Telegram that give you insight on what will be the possible outcomes of some events. But so far, about the Telegram casinos,  I have heard mixed reviews about them. Some people find it convenient and enjoy the privacy aspect offered by the Telegram app. While for others expressed concerns about the reliability and security of these kinds of platforms, as well as the lack of regulation compared to traditional casinos.