Copyright doesn’t last forever. Thank God. Copyright for Peter Pan and Tinkerbell expired sometime in the fifties. Most likely the year before Disney used them as characters. They did the same thing with Jungle Book.
The copyright in Peter Pan expired at the end of 2007. So Disney was in violation for 54 years. In that time, according to Wikipedia, the film has grossed over $87 million. Not one cent for the sick children.