Fearless Concurrency: Threads, Channels, Shared State

Why does the main thread drop its original sender before collecting messages?

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use std::sync::mpsc;
use std::thread;

fn main() {
    let (tx, rx) = mpsc::channel();
    let mut workers = Vec::new();
    for i in 0..3 {
        let sender = tx.clone();
        workers.push(thread::spawn(move || sender.send(i * 10).unwrap()));
    }
    drop(tx);
    let mut values: Vec<_> = rx.iter().collect();
    for worker in workers {
        worker.join().unwrap();
    }
    values.sort_unstable();
    println!("{values:?}");
}