Scammers in Telegram, well, there are scammers without Telegram, just why position a beautiful creation like Telegram with scammers, 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.
So who are you trying to blame for that, the group that created the Telegram app? You need to understand that it is not their fault, and if you get scammed, you have yourself to blame for believing trash that a scammer is telling you. It's just like we have Bitcoin - Bitcoin was created for a good purpose, but there are also evil people that are misusing Bitcoin and using it for good.
Recently a hospital got hacked and the hackers were demanding for Bitcoin as a payment. So who are you going to blame for all that is happening, are you going to blame the cryptocurrency community as a whole or you will blame those who are now misusing it? Telegram was created with a good purpose in mind, it's left for you on whatever you want to do with it.