Oh really? Remember New World? Several hundreds of thousands of viewers on Twitch, roughly 1 million concurrent players online at the same time. What happened to that game?
Oh right :
https://steamcharts.com/app/1063730
39k players, all time peak 900k. Currently 1.7k viewers on Twitch. LOL. Clearly despite being so popular on Twitch at one point it never managed to break 1 million players (which FFXIV already has despite historically having very little Twitch viewership, at it's peak of viewership in last Summer it only managed a fraction of what New World achieved at it's peak) and is now nearly completely dead. What does this information tell you?