https://www.pcgamer.com/apex-legends-ended-fortnites-twitch-streak-in-february/

Fortnite had a really great run on Twitch. 11 months as the most watched game is pretty impressive. Not quite as impressive as a year, however, which it probably would have managed if it wasn't for Apex Legends, which swooped in to take the top spot for February. 

Respawn's battle royale managed to draw in a higher peak viewer number and averaged more viewers across the month than Fortnite, as well as every other game being streamed. Fortnite ended up being just a bit less popular on Twitch than League of Legends, which was the second most watched game.