A Ringworld would be more likely than a Dyson sphere, the mass requirements are so much lower.

But it’s unstable.

If a civilization can figure out how to make one, they can keep it from sliding into the sun!

Like how if they figure out how to build an 833’ long ship they can keep it from immediately hitting an iceberg and sinking?

Damn, imagine the number of lifeboats you’d need to evacuate a Dyson Sphere?