Simple script that clicks "Not interested" on every recommendation on the YouTube home page (2021-03-07)

notinterested.js

(async function list(elements, i=0, delay=50) {
    const x = elements[i];
    if (!x) return;

    x.click();
    
    await new Promise(resolve => {
        setTimeout(resolve, delay);
    });

    const listbox = document.querySelector("tp-yt-paper-listbox");
    (listbox.children[4] ?? listbox.children[0]).click(); // [0] handles Mix playlists which only have a "Not interested" button

    setTimeout(() => {
        list(elements, i + 1);
    }, delay);
})(document.querySelectorAll("[aria-label='Action menu']"));