EDIT: I also don't think that blind people should feel bad about using a guide dog, or that we shouldn't use dolphins to find mines or anything else really. If you can use it, use it! I only object to senseless torture and torment.
The only downside is we've wasted some entropy and time on it. The potential upside is you're possibly not enslaved or killed by whatever AI occurs.
EDIT: Just to be clear when I talk about enslaving animals I'm referring to use of animals in law enforcement, medicine, war, farming, hunting, for companionship, for food production, material production etc.
There are plenty of people who don't weigh the ethics at all and just eat whatever animal they want, but in many societies eating a dolphin or a gorilla is considered repugnant.
Perhaps it's more correct to say morals than ethics here.