Why? "Threadiverse" has been used before Threads became a thing, and "thread" is a generic term that has existed for ages and doesn't belong to Meta.

Meta did try to make "Threads", but (a) it failed miserably and (b) use of that term on Lemmy predates Meta trying to steal it. We don't need to let them define us! And all the more so if there's no better word - the next runner up in polls iirc is Forumverse, but people vastly prefer Threadiverse.:-)