It's very simple to understand if you know how technology works and especially if you knew how the platform works.
Some scammers just alter the names of admin for example: r1a2y3m4 and some scammers will alter 1 with !, a with @.
if you use telegram from a long time I think it is impossible to scam those people but if you just joined the app then there may be chances that you will be scammed as you don't know much about telegram at that time and if a scammer contacts you, he will give you a really good offer that you will somehow accept. Whenever any scammer contacted me they didn't leave the username blank but instead, they miss spell the admin name.
As an example if the admin name is "Wallo" so the scammer, first of all, use the same picture to try to convince you that you saw him in the group 2nd he will use the name like "Walo" or name other small changes they if you don't focus you will think they are real.