<<The birds get their required exercise, and they are encouraged to work for their food.>>
And in between "shows" they are sometimes kept in what I, as a bird lover, would describe as quite appalling conditions. My wife and I visited one of these places a few years ago. Seeing the birds fly was great, but seeing them sitting on small wooden perches in enclosures no bigger than my garden shed was heart-breaking. Those that appear at various country shows are carted around, cooped up in lorries. This is not, I suggest, the proper life for a wild bird.
"Re-introduction" of various species, e.g. Red Kite, has not, I suggest, any real benefit for the birds. It merely satisfies some bizarre human desire to prove it can be done. The attempted re-introduction of Bustards was tragic in the early days..