unsubfromeveryone.js

// STEPS TO USE:
// 1. Go to https://www.youtube.com/feed/channels
// 2. Right click > Inspect Element > Console
// 3. Paste script
// 4. Press enter

var count = document.querySelectorAll("ytd-channel-renderer:not(.ytd-item-section-renderer)").length;
tick();

function tick() {
    if (count == 0) return console.log("Completed! Subscribe to Coder Gautam on YT!");

    el = document.querySelector('.ytd-subscribe-button-renderer');
    el.click();

    setTimeout(function () {
        var unSubBtn = document.getElementById("confirm-button").click();
        count--;
        console.log(count + " remaining");

        setTimeout(function () {
            el = document.querySelector("ytd-channel-renderer");
            el.parentNode.removeChild(el);

            tick();
        }, 5);
    }, 5);
}