While it may work in rare cases just think about people as a whole. Look how many people rehome their birds because they are too whatever the owner didn't know to expect. You can go on Craigslist and any given day I see MULTIPLE people begging for a free dog to be a therapy pet but they don't want to teach the dog to fulfill their needs they want it to already come pre-trained, vaccinated and fixed they also want this free dog to come with everything it will ever need. Do you think that dog would be going to a good home? Probably not and I flag every free dog begger I see. Now just think if it became a thing for birds. Birds are more difficult to take care of than dogs, but they are smaller more portable and can talk and WILL bite. That being said most people who want a service animal can't handle loud noises. Birds are loud. Just imagine if therapy birds became a thing with the thousands of irresponsible owners already you would have more birds who "accidently" fly off and more birds rehome because the owner just can't handle a bird.