Google Search brought in lots of revenue (comparatively), but in return they became dependent on the whims of a crazy-large tech company that has turned the corner into a full-on IBM-style corporation. I've seen this kind of thing happen with people advertising local businesses on Facebook and then the algorithm killing their income overnight. You have to treat it as a large risk to your business and do everything you can think of to mitigate it. Which maybe they were, I don't know, but I wouldn't want my business to be reliant on the good nature of a huge tech company like Google.