It's usually very important as a person to exercise patience when engaging with online platforms. Some people becomes to greedy when the here about money doubling just like the one in your post which say invest 50$ and get 100$. All these are just schemes to lure you into investing at a very high risk. Before engaging with any platform whether you are a beginner or an expert it's very necessary to check out some few details about the platform. Do not fall for their tricks, as most of them now display payment proofs on their platform. Just do a quick review to be sure of what you are getting involved with.
Although I have made an edit on my profile after LDL's case, so I no longer use telegram and as such I don't think I'll be ever experience this telegram channel in Op.
Just because one person fell for some stupid scam shouldn't be a reason for everyone to stop using telegram. As we all know even as telegram is used as a means for scamming, it also has been very helpful to a lot of people including us, users of this forum through Many good bot (the superboy notifier) and many other bots that has been useful. So I will just give one advise to all out there just be mindful of the thing you do on telegram.