It's hard to trust even ordinary lottery sites, but it's hard to trust a telegram boat.
Is it possible that this bot is open source, or at least published so that everyone can see the algorithm?
Not everyone is technical enough to understand the algorithm even if it is made public. If you give me the algorithm and ask me to validate it, maybe I will refuse as I do not have the required knowledge.
Generally I do not trust lotteries but only if there is good feedback by many people, only then I can give it a try.