This kind of scheme does exist in cryptocurrency trading, a lot of platforms are driven by affiliates and commission is normal.
The paid signal group also exists where you can invite someone and get a commission but the commission I think is only 1 time for this.
I guess I was talking about commissions from trade fee/commission. So it is less about getting someone to sign up but more about getting people to trade. Hence they do not care if you deposit $1 each time. They want you to get hooked and trade and trade, More volume is more commissions. They make money if you lose and if you win.