I have no sources backing this, but I think it could be related to the ban of a big streamer recently who made a "controversial" stance about what's happening in Gaza [0] and that could have lead to some people mass creating accounts on Twitch (that would not be unheard of when that kind of events happen, but again, I haven't seen any report of that happening).
[0]: https://x.com/HasanabiProd/status/1845889127629176966