Sure but it's also not a pink elephant and not a flower pot. It's none of those things. We have just as much evidence of those objects flying through space as we have of alien spaceships so far. So it's odd asking "So is it a spaceship or not?" just like it's odd asking "so is it a flower pot?".
Is Musk's red car a spaceship btw? Because if we are able to send such stuff to space, other intelligent beings would most probably do the same. Or they are more intelligent?