The Drake Equation

The Drake Equation:

Have you heard of the Drake Equation?
It is an Equation that can be used to find out the number of intelligent civilizations in our galaxy.
It can be expressed by

Plugging in the current Estimates, we get a maximum of 15,600,000 and, a minimum of zero.
So, are we alone in this universe?
Or is there life on other planets wondering about the same thing.
There is a 1 in 60,000,000,000 chance that Earth is the only planet in the history of the universe to ever host life.
So, why is it that someone hasn't reached out to us after all this time?
Is it due to the Fermi Paradox?
Are they watching over us?
Or is life so transient that even two contemporary civilizations vanquish before they even become aware of each others existence.
The Physical Laws of the Universe might hinder communication forever or they might not only time can tell.