A whole summer mid-college in my late teens (three months of prime time it turned out!) coding a cloud e-learning platform for the industrial training vertical (what a Cornerstone does today basically) for a partner who then didn't sell any product, disappeared and I had to go and sue - cost me both time and legal fees!
Google closing down the radio & tv ads business (c. 2009) was a function more of an acquisition that went badly and an industry that was loathe to change - so imho don't think there's a great corollary here.