Do they really want the people who stayed on Facebook that drove out the initial wave of cool users to go to their new site and drove people away too?

I don't really understand Facebook's logic here. It's widely known that throwing money at a social networking site doesn't create sustainable growth, see Google Plus as an example.

Besides, it seems to me that Threads is just filled with blue checked celeb accounts nowadays and they (usually their social media person) barely ever post anything there, nevermind anything interesting or funny, and I don't think people actually care for that at all.