Google +
A smart entrepreneur learns from the failures of others. Check out this blog to know why google+ failed and lessons that you can learn.
https://www.apptunix.com/blog/why-google-failed-5-lessons-to-learn-for-entrepreneurs/
Heinz EZ Squirt Ketchup (it was very popular for a while)
From fruity, neon-colored cereal, to candies with the inexplicable color of blue raspberry, kids love bright food products and corporations know this well. This line of thinking likely contributed to the introduction of Heinz's EZ Squirt ketchups.
Microsoft Zune
Everyone knows that Zune failed, but what was the real reasoning behind this tech casualty? The truth may surprise you.
https://history-computer.com/the-real-reason-zune-failed-spectacularly/