Somewhat true, but their are alot of poeple that release snakes that get to big. Their are more irresponsible owners than responsible ones. Alot of poeple are impulse buyers not knowing what they are getting into when they purchase large species of snakes.

Just like in my area, a few years a ago a park ranger in a small wildlife reserve was taking water sample in a lake and a 14 foot Anaconda swam by his boat, it most likely didn't survive the winter. The problem is mainly irresponsible snake owners.