Roast my viral loop generator

Hi hackers,
I have developed a microsaas in my free time to learn how to deploy a fully serverless application.

Virale.io allows you to create links to share with your audience (e.g. to publish an ebook, access to an app). Whoever receives the link, to gain access, must share the same link with 3 friends.

At this point, the user interested in accessing the ebook will send the link to a couple of friends, probably more than three, because he knows that not all of them will respond immediately and will be ready to do so. As soon as the first three accept, they will get permission to access the content. However, if the link has been sent in a WhatsApp group or on social networks, other people may want to have access, at that point no longer available. They will then have to share the link in turn, creating a sort of viral loop.

Here an example -> https://www.virale.io/ese

At the moment is completely free.

What do you think about it?