Many things change if the next generations will select another service because they have a bad impression (correct or not) about something.
Did you personally select anything IBM lately? At some point many years ago, people were saying "Getting rid of IBM in a corporate setting is close to impossible.
Actually it is about the perceived risk distribution within an org, not really about the quality of the product. "No one got fired for buying an IBM" directly tells the decision maker that their risk of getting questioned internally is low due to the brand reputation of IBM. It's a play on risk.