Regardless of how legit your service is, I'd stay away from a service that asks me to join a sketchy Telegram group before I can access them. There are many tools out there that can compete with yours, most of the time there is a free option that allows users to test them without giving unnecessary personal information.

You should probably improve and offer other means to access your service if you really want to get customers and not just exit scam after you earn a hundred or a thousand deposit.