I mean, to be honest, I feel like it's the quality of the content in there. I used my old phone (the one I use for apps like threads) to get a threads account and people are using Threads as if they're using instagram.
For example, you see a pocture of someone or a drawing, you get into the post to see the 45 comments people left and all of them are:
That's pretty much exactly what I expected. Instagram is exactly like this. Filled to the brim with fake engagement, bots, and an occasional real person account, who also happens to be doing things that horribly affect people's mental health
toxic and useless dont really summarize it imo- last few times I went there the top 10-15 comments were just screaming right wingers yelling about a conspiracy of some sort no matter what the topic is
Looking in the replies of any new scientific discovery is infuriating, they're all spouting inane shit about how "science changed its story, so it has no credibility, this is proof that the earth is flat and 6000 years old."
the only reason it has any users is that it gave some fakeout on insta UI that your friends were talking about you on threads and, as per Meta usual, it was all bullshit. typical zuccing egotism for his upcoming cagematch.