I called it a scheme since it is a scale systematic plan or arrangement for attaining a particular object or putting a particular idea into effect. When using a trading bot you're always expecting it to gain a profit and never loss. Do you mind sharing the trading bots you are using with us?
Yes, bots are basically putting an idea into work but I don't think anyone expects only profits and no loss from bots. I mean bots are going to have loss too because even the best traders have bad days and the bots are not invincible.
Comparing with a scheme is actually a curious way of looking at it, a scheme usually means they will give you a offer and you accept it but the bots are not going to work for others instead they are going to work for you and it will be you will be the one entering various data based on which the bot will then execute trades so it is more like a support for you and the developer charges their fees for making it.