A long time ago, I created a website; invited friends and family to check it out, leave comments, and whatever. I had to send them the Web address. That's it.
During those days, we were all on the deep web. No one could find you unless you gave them your address.
That was in the old HTML days, before concerning ourselves with how to code so the web crawlers could find us and let the world know about our site. It's been all downhill since then.