There's no data but to the best of our scientific knowledge, this is how the universe works. Life is hard. We know that because it took billions of years from

There's no data but to the best of our scientific knowledge, this is how the universe works. Life is hard. We know that because it took billions of years from the first self-replicating molecules to us. We also know there are things happening in our solar system that wiped us out. We know we could have wiped our species out ourselves. The "great filter" is one theory to explain why on the one hand we should be observing other civilizations, but we don't. Also they don't need to use Dyson Spheres exactly. But before they start expanding in earnest, they would have a measurable effect on the emissions coming from their star, as perceived from other stars.