They bring a new product type to cryptocurrency market but change it completely is impossible. It is only one new option among other available options so that people can choose from.
Not all Bitcoiners use Telegram and if they don't use Telegram, it's hard to convince them to use Telegram trading app. Not all Telegram users will be ready to use that Telegram trading app.
I think it's not bad to say that they are part of the change or revolution for bringing something new in the table. I use Telegram but I'm not into trading, so I won't still engage on these but for those traders that doesn't use a Telegram, I guess these trading apps inside Telegram is only going to be their first reason of trying it.
I also don't wanna exaggerate their success but it's also good to see a young project achieve such success in a short period of time.
Good thing that you know or admit it that it was a kind of exaggeration, because it was indeed one. A true success doesn't have a shortcut and will only be achieved in a long period of time. In case you ever see one who did for the short term, expect that they will still fail and it can also happen very quickly. I think you can only say that, because you lack in patience and you want to earn an easy money.