It's funny to read the comments under this post saying that "Telegram is bad".
Yes, Telegram is proprietary crap, but this naive person could have been scammed anywhere else. He was scammed on Telegram because he doesn't know how to use Telegram.
Also, if the administrators of this chat knew how to use Telegram, they could make life more difficult for scammers.
I've been using Telegram for about 10 years, I'm in several dozen chats, including support chats for various services, and I've never been deceived in 10 years.
That's why nostr:npub1exv22uulqnmlluszc4yk92jhs2e5ajcs6mu3t00a6avzjcalj9csm7d828 is perfect for support chats (where users cannot send DMs to each other, only the admins can) or even for a separate support account.