Every new users will then begin to play in our site in "safe mode". He won't be allowed to create or subscribe rated games until he had be playing at least 5 unrated games (5 is only an example. The exact number is undecided yet).

As usual the problem is not about "if" but about "when".
Let's begin subdivinding labour/bold] we have to work on the site, and you have to wait (playing in the meantime if you want to )