Telegram is a multi-functional tool with the ability to create a bot and a lot of other functionality, but as the question comes to do something useful through Telegram, many say telegram and there are scammers.
There are frauds and scammers literally in every phase of life, bank frauds, credit cards frauds and the list goes on and on and that include the BTCitcoin market in the form of fake mining companies and shit projects in the form of ICO projects fake wallet providers and exchanges and what do you understand seeing the amount of scammers in different varied sectors, it is not associated with any specific sector, where ever there is an opportunity to scam and make money you will find fraudsters trying their hand and i am surprised that you are baffled by that 
. Be cautious what you deal and you will be safe, never fall for fantasy returns or illogical investments and that is the only precaution you can take.