Releasing ants is fine if they are from very localized area. Like walking distance. Some don't like it cause say its cause of some pathogen/disease that can spread from inside the house to outside...but then at that point there would probably be way bigger worries than ants lol. And not different than driving in the desert or/and walking in mud as an example, and then transporting the mud from a whole new area on either a vehicle or shoes to another region/area. That has an even greater chance of releasing some disease to the area, since its dirt (or whatever it happens to be stuck on the car/shoes) from not even the persons local area. Not to mention if bringing dirt or any particles of the ground from another country (which probably happens a lot with people backpacking in jungles and what not, I doubt they clean their shoes over and over as they keep adventuring in the jungle). I bet a lot of aircraft have brought over particles from another country to other countries...again just as good of a chance of bringing "foreign" contaminates as a captive ant colony and then releasing it into the wild.
Antscanada is a very well known ant keeper and he releases his ants with much success. He is also followed by hundreds of thousands, almost a million, on Youtube.
Just make sure they are local, even an ant a mile away might be considered the same species today. But, later it might find out they aren't the same species at all and only native to that local area. Also, make sure they are native (I know in your post you said they are, but this is for others who may read this too), releasing non-native ants even if they are local is very bad. Even if the non-native ants are everywhere, its highly recommended not to release any non-native ants as its very bad for the local ecosystem.
Edited by Vendayn, June 14 2017 - 9:33 AM.