> Fermi-paradox is paradox for a reason!
The Fermi paradox is just a way to have fun at parties (or over the internet, especially on HN). There are so many possible solutions to the Fermi paradox. But each solution has questions, and answers, and more questions and more answers. That's why it's so fun.
But it's not that deep.
To the point, the Dyson swarm is virtually guaranteed to not be used by any advanced civilization. Once a civilization tames nuclear fusion (and we are on the brink of doing so), then harnessing the energy produced by the local star via a bunch of solar panels becomes just a clunky way of getting energy. Controlled nuclear fusion can be many, many orders of magnitude more productive and convenient compared to solar energy. A star is indeed a massive fusion reactor, but it's a very slow one. Our Sun in particular produces about as much energy per pounds as the heat produced by the fermentation of manure. ITER is projected to produce hundreds of millions of time more. And ITER is just the beginning. Sure, the Sun contains most of the matter in the solar system, but plenty exists in the planets. We could use hydrogen stripped from Jupiter to produce trillions of times more power than a Dyson swarm could produce, and we can have that in a portable form that we could take with us in interstellar travels.
Bottom line, whoever is looking to find Dyson spheres out there in the sky, is simply wasting time.