I was curious and surprised you didn't link to your site at all so I looked at your submission history and I believe you're referring to this: https://news.ycombinator.com/item?id=6670113 ? This links to https://volafile.org/ which I have to say is pretty damn awesome as a concept! Simple yet effective.

curious why you didn't choose to charge a fee for registering an account in the end?

Are you monetizing the service in any way? I assume hosting files up to 20GB doesn't come for free right?