They are viewed as a 'safe' choice for enterprise customers in that they've been around forever, run on pretty much everything, and have product offerings that

They are viewed as a 'safe' choice for enterprise customers in that they've been around forever, run on pretty much everything, and have product offerings that can tick off pretty much every vendor selection checkbox. They're essentially the IBM of databases (if you're not already tied to DB/2 as a 'big blue' shop or SQL Server as a Microsoft shop)