Throughout the 1990s and early-2000s when Object-oriented programming and its spin-off: Component-oriented programming, were popular, there wasn't any interest

Throughout the 1990s and early-2000s when Object-oriented programming and its spin-off: Component-oriented programming, were popular, there wasn't any interest in functional programming nor concepts like immutability (which, at face-value, flies in the face of OOP (until you gain a deeper understanding and agree it's a very good thing)). Haskell itself didn't attract much attention until the mid-2000s.