Synthesizers, pianos and treadmills are all effectively free in a great many American burbs and urbs. People will literally pay you to get rid of them.
But all the free synths I’ve recycled had a very high barrier to entry - controls and labels incomprehensible to anyone without mentoring or training. I puzzled over some of them for hours without learning very much! This thing, as gaudy and fisher-price as it may look, seems to have actually had some user interface design principles applied to it.