Substack: bypass tracking-redirect on outbound links

// Rewrite Substack tracking-redirect URLs back to their real destination
(function () {
  function decodeOnce(u) {
    try {
      var url = new URL(u, location.href);
      // common patterns: /redirect/2?...&url=ENC or /redirect?u=ENC
      if (!/substack\.com/i.test(url.hostname) && !/^substack/i.test(url.hostname)) { return u; }
      if (!/\/redirect/i.test(url.pathname)) { return u; }
      var target = url.searchParams.get('url') || url.searchParams.get('u') || url.searchParams.get('to');
      if (!target) { return u; }
      try { target = decodeURIComponent(target); } catch (e) {}
      return target;
    } catch (e) { return u; }
  }
  function patch() {
    document.querySelectorAll('a[href*="/redirect"]').forEach(function (a) {
      if (a.dataset.jzSubLink) { return; }
      var h = a.getAttribute('href') || '';
      var clean = decodeOnce(h);
      if (clean && clean !== h) { a.setAttribute('href', clean); }
      a.dataset.jzSubLink = '1';
    });
  }
  patch();
  var obs = new MutationObserver(function () {
    clearTimeout(window.__jzSubLinks);
    window.__jzSubLinks = setTimeout(patch, 400);
  });
  obs.observe(document.body, { childList: true, subtree: true });
})();