The best practice is to keep local ants. Almost all ant keepers suggest doing that. Also invasive ants that already have a foothold in the area is fine, like keeping fire ants for instance, though one should be more vigilant about keeping them in captivity and never risk letting them free. I would suppose new invasive should be only kept by expert keepers. I wouldn't even say those experts should be zoos, just well trained. Part of that training might be that they would decide not to keep them at all. So there is that. Some ants can't climb as well as others and are easier to set up confinements for. Some ants are nigh impossible to keep in or out...