> They're using the most popular social network which they happen to own, which already has pre-built social connections for most people who might want to try Threads

For sure. And I’m not writing off Threads being a popular app, just the notion that it’ll displace Twitter. To me Twitter is in a different social space than Instagram: the town square rather than the pub with my friends. Even if I move all my pub friends to sit in the town square it won’t be the same thing.