follow all hackerone programs, open https://hackerone.com/hacktivity, paste and run this code in your browser console

paste_in_console.js

fetch('https://hackerone.com/current_user')
  .then(res => res.json())
  .then(user => {
    fetch('https://hackerone.com/programs/search?query=type%3Ahackerone&sort=published_at%3Adescending&page=1&limit=1000')
      .then(res => res.json())
      .then(res => res.results)
      .then(res => res.forEach((r, i) => {
        setTimeout(() => {
          var url = `https://hackerone.com${r.url}/policy_subscriptions`;
          fetch(url)
            .then(res => res.json())
            .then(res => {
              if (!res.subscription) {
                fetch(url, {
                  method: 'PATCH',
                  headers:{
                    'x-csrf-token': user.csrf_token,
                  },
                });
              }
            });
        }, 1000 * i);
      }));
  });