How many users do you need to start a project?

Question

Startups

There is a project. Site content should be created by users (photos, comments). There is initial content. How many users per day (and how many days) do you need to attract in order for the content to start growing on its own?
Interested in at least an approximate figure with which you can start experimenting on a specific project. Well, or articles on the topic, because. I couldn't find any help on google.
PS I will unsubscribe here according to the results, how many users will be needed in practice for the life of the project (in my case). I hope someone will be interested.

Answer 1

Such projects develop well if at least 2-5 people leave any information per day. This will be a great start, and then it depends on how convenient and relevant your project is.

Answer 2

From one. Even one client can pay for everything.
To infinity. Even billions of clients may not pay off the project.

Answer 3

Probably, it is worth reformulating the topic of the question into "how many users need to be attracted to the project so that the project begins to grow on its own" . Growth hacking is such a tricky industry and there are really few specialists in it. Try to read the history of the development of pinterest - for sure it is on the network somewhere. I would do that)