You may recently get offer by a anonymous account with a telegram premium offering you to buy your username like this.
It is very simple to realize that it is scam.
From telegram to Fragment websites, if people are simply careful, they won't be scammed. Being directed from Telegram to Fragment that I don't know what it is, people who were victims of this scam, are very careless practically.
Many more scams on telegram.
Telegram ScamsSome Telegram tips for newcomers in the crypto community