That hasn't been my observation at all. 100% of the stuff I find on Spotify is improvised and interpretative.
Could you point to some specifics? Not only is that interesting, perhaps it can also provide insight into the underpinnings of the "identity" of a raga. I think there is definitely a commonality between different people rendering the raga but I haven't come across a "cookie-cutter" of the sorts.
Thanks for your comment!