Last year, as I was checking the licensing and attribution on the tracks in my soundtrack library for Lunatics, I came across a bizarre and rather disturbing practice: bait and switch licensing as a ploy to sell music. This is a truly weird idea, if you understand what a free-license means, and it's deeply unethical, but here's what I think is going on: the artist (or more likely, some intermediary, such as a small record label) gets the idea of using a "free" loss-leader to try to draw people into buying a commercial/proprietary album.
Do you remember that old game that you used to play all the time? Do you still play it? It probably isn’t free software. Do you wish it was? Sometimes writing a clone of a game is a lot of work compared to the amount of work it takes to relicense one. Here is a story about how one group of people are going about freeing the game known as “Moria”.