They are often considered a invasive species and can easily proliferate out of control disrupting the natural ecosystem.

It's not a person problem, it's a people problem. Think about how many shitty pet owners exist right now, and then how many strays are out on the streets because randoms that don't give a shit are allowed unregulated access to these animals. Throwing ants into this mix leads to a cataclysmic environmental situations very quickly.