I am so sad to see Buttons Adventures go, i loved it so much! I do see the point Hasbro is making, i don't agree with it however and to be honest i think actions like this are rather cold and mean spirited .
Art works like Button Adventures is a expression of love for the show. It's not a rip off, it's a homage and artists like jan animations are the people that shape our love for us.
Sure it did includes show original characters, but it's a tribute, not some cheesy moving doodles that try to cash in on the shows success.
Maybe companies should stand in front of a mirror, look them selves in the eyes and ask them selves do we really want to spend time and energy into people that do not damage our image or reduce our income in any way? I don't think they will, but hey, wishful thinking right?
Copyright laws are from year 0 and some people need to start ignoring the big bucks that big companies trow at them and just look honestly at these laws, might not change a lot, but every little bit is better right?