About the only thing we can say regarding ETI is that if they are out
there (or here), they are not being terribly obvious (waiting for the
UFO crowd to start clamoring, for which I say "Show me the evidence!").

400 billion stars in the Milky Way spread out across 100,000 light years.

100 billion galaxies in a Universe 13.7 billion light years across. And
apparently our Universe is much bigger than what we can see, plus
there may be many, many universes beyond our own.

So I think we are just too small and young to be noticed or perhaps
taken seriously yet by anyone more advanced than us. Only a few of
our space probes have barely left the Sol system and our broadcasts,
most of them relatively weak, have barely created a bubble around our
system only 200 light years across.

Even if there are only 200 or so ETI societies in the galaxy, if a few of
them are seriously advanced, then it won't matter how few they are
because a sophisticated one could find us. Whether they want to
talk with us at this point is another matter, though.

Just because we exist does not mean we are automatically worthy of
contact, not to mention a host of other factors.

This is why we actively need to search and not just wait around for
someone to call us.