I'm a pretty big FFXIV fanboy but there's really no big community on Twitch for it and certainly not for ultimate raiding. There's virtually no "big twitch bucks" to be made playing FFXIV. It terms of stream content, FFXIV doesn't even have 5% of WoW's viewership Ironically, the "largest" FFXIV streamer (and the only one to get 1k+ views) is Jesse Cox, a variety youtuber and long time WoW player. FFXIV's biggest streamer is still a WoW player, and not an ultimate raider. Second largest would be itsmeJP, Jesse Cox's friend (also from WoW). You'd have to get to ZelpaHQ as the "biggest" FFXIV streamer, but even she is a WoW transplant and got a huge boost from the WoW community courtesy of some of her YT videos being watched by Asmongold (the 50,000+ viewer WoW streamer).
Even during ultimate raiding - FFXIV's viewership "skyrockets" to like 20,000 viewers, which is not a lot. Their hugest all time spike was 31k (literal launch of the expansion) - compared to WoW's launches of 730,000 (Shadowlands) or 1,000,000 + (Classic Launch). FFXIV's "serious raiders" don't stream during the race to world first - as everyone is going in blind (as opposed to WoW's raiders going in with PTR testing/training/pre-loaded DBM).
Point being - FFXIV's twitch community is basically non-existent. If hardcore raiders are worried about money, they'd probably be playing a different game. They're just autistic about being known as "hardcore" players, even though none of them are really "hardcore" (none of them are World First raiders, AFAIK).