any investment schemes on telegram is most likely a scam.
Scammers love that platform to create automated bots to make money for them because it is anonymous, and it makes the user more comfortable since he thinks that he's actually chatting with somebody. Probably cheaper than an entire website as well.
I've seen several HYIPs being hosted on Telegram with a automated bot. None of them are legit.
What you're describing seems like a ponzi/HYIP as well, just using cloud mining as their cover story. Even legit cloud mining is unprofitable, let alone scam ones that will just rip your money off you.