Could these be unrealistic promises? Rewards in real money with no wagering requirements sound too good to be true. Casinos typically have wagering requirements to prevent bonus abuse.
And how we can verify that this online casino is licensed on the Telegram platform?
Yeah, that is something which actually came to my mind as well. Sounds very weird and kind of unrealistic a casino which is based and run in a platform like Telegram somehow managed to get licensed by some reputable license issuers, specifically those in the same league which provide of license to big and reliable casinos.
Perhaps OP is trying to mean his casino running on Telegram is some kind of extension or addon to some web domain/desktop casino he wants to use for the sake of getting the license, otherwise, I find it very difficult to license issuers to set such precedent and giving green light to a casino of this characteristics.
Also, realistically, they are going to implement wagering restrictions on those bonuses, for the sake of their profitably, if they do not they abuse will be inevitable.