I get messages everyday in Telegram.
Most of them approached me as investors, group admins or affiliates.
One way to detect them is that they will approach us first. And they always start with 'Hey User'.
Real investors or admins dont simply approach other people until we ask for their help first.
Well, i think that is a common way for scammer to approach their victim.
That's why there are many telegram group admin announce that they never PM you first.
Usually the user who want to ask about something, PM the admin first, and then the admin will reply and continuing the conversation between user and admin.