There already is an extensive
research on this. Some guy pulled all of twitch chat history and mapped them depending on how many channel shares chatters and basically they are very fragmented and tends to only watch the native speakers. Alledgedly this is updated every month.
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Tl;dr Spanish only watches fortnite twitch streamers when it comes to english streamers and mostly stick to watching the natives. Italy & France lives on their own island just like russia and minecraft, german actually is the closest to english speakers.
Any country not named in the picture does not have a twitch presence, maybe they are on Facebook.
Just because you dont see it doesnt mean they dont exist. Ibai is the biggest streamer on earth and his content is frankly far better than every twitch streamers. The guy is literally treated as a rock star by the natives.