That's true.. and if you followed that advice..
- You would never have started retailmenot (too dependent on Google traffic)
- You would never start Buffer and have over 10 million in annual revenue (too dependent on twitter api)
- You would never would have started Heroku and get acquired for millions (too dependent on AWS)
- You would never have started SimilarWeb and be valued at over 100 million dollars (too dependent on browser extensions and Google)