I've continued investigating, and it looks like a scam. Initially, I was surprised because the information came from a close friend who confirmed that he was selling small amounts of Tether and receiving deposits in the bank.
Don't believe everything with your close friends. If it's related to money, many of them are going to be happily selling their souls to anybody just for them to have that quick buck.
If he's not convinced that it's a scam, he'll likely be one of the victims soon and don't listen to anything he say when you know the truth. Listen to him but never follow the advises he'll say.
And that is because you know the reality that he's talking BS and it's just hard to swallow the pill when someone goes against you and that's what he's experiencing right now.