Even a modest Dyson cloud built with, say, the matter in two useless planets, Mercury and Venus, would provide so much energy it could power a few quintillion Raspberry Pi-sized processors for literal ages. This is why there are no interstellar species: what’s the point in expanding away from a star that provides all the energy needs you and your digital descendants will ever require? Even when the star becomes senescent, all you have to do is move the cloud outwards until the star finally goes nova–at which point you just move the cloud to the nearest convenient star.
Because the sun is a dull g-class dwarf, imagine what you could do with something bigger.
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No, it’s going to work out great, the Dyson Sphere is going to be in the vacuum of space, and Dyson knows all about vacuums.
The first step of our project will be creating a massive vacuum designed to suck up the vacuum of space. If we remove enough space, the expansion of the universe should slow down and then reverse. With the galaxies and stars closer together, traveling to other solar systems will be much easier. And don’t worry about everything collapsing into a point of infinite densitiy. If stuff gets too close together, we can just let some of the vacuum back out of the bag.
We already have a small-scale prototype, pictured below:
This model can only handle single-planet atmospheres, but once we scale up to the final version, it is really going to suck.
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Not sure what you mean. I was referring to the Kardashev scale, which I doubt many Mexican wall fans know of, or care about.
Well, we’ve got free energy, what more do you want? 
Building a Dyson sphere around your sun is a sure tip-off (at light speed) to anyone watching. The trick is to mount lights on the outside to fool them.
“Heeeey, this isn’t the real star. We’ve been watching a 100 year video loop!”
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