2. But the whole point here is that others aren't doing this any more. Threads isn't supposed to be an innovation, just a Twitter replacement. Twitter is dying, Mastodon is too complicated for non-geeks, BlueSky could have been a contender but they didn't get their act together quickly enough.
3. You're in a geek information bubble here. On the scale of social media, almost nobody cares about that sort of thing. I'd bet money that the overwhelming majority of FB users have never even heard of Zuckerberg.