YouTube – unsubscribe all

unsub.js

// run in console on https://www.youtube.com/feed/channels (and wait):
document.querySelectorAll("paper-button[subscribed]").forEach((btn, i) => {
  setTimeout(()=>{
    btn.click();
    setTimeout(()=>{
      document.querySelector("paper-button.style-blue-text").click()
    }, 500)
  }, 1000 + (i*2500));
});