The idea that hyper sophisticated alien societies will all naturally build a fantastically complex object that a futurist ape dreamed up before our planet had even travelled to the moon is the height of hubris.
A dyson swarm can be possible theoretically and a civilisation can potentially build a swarm with enough technological prowess. It’s just Solar Energy so it’s likely that other civilisations also have same ideas as humans when it comes to this.
Although the most likely explanation is still that it’s just dust.
We have literally no idea what an alien society is likely to do.
Just because the dominant ideology of Dyson’s time was a valorization of unquenchable resource extraction doesn’t mean it’s at all logical to project that value structure even on different human societies, much less literally alien ones.
