I've read similar articles like this and it is very sad to know that this stuff goes on... The problem is, it is usually not intentional.
Most people who choose to "give" away a pet for free do so with the thinking: "I would rather get this pet a good home than get money for it." This is a thought born out of caring but unfortunately also of ignorance of the reality that faces their pet. If they would know better, this wouldn't happen anymore.
So until these messages spread out about having a pet relocated, this will still go on a lot...