The idea of megastructures has been adopted in a mod of the 4X game Stellaris from 2016.
Has anyone played that game, yet?
I find it quite interesting that these ideas get adopted like this.
Yes, I play Stellaris time to time. One session lasts 20+ hours and you never win. And Stellaris has difficulties with the performance, especially in the late game. But it’s kinda cool.
I play only multiplayer, so no mods. Dysonspheres and ringworlds came to the game with the Utopia DLC, on which mentioned mod is based on, I think.
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Then who wins instead? 
If you came so far, usually the endgame crisis 
You can currently get Stellaris for a quarter of the regular price on Steam. In just purchased the Stellaris Starter pack with Stellaris, Stellaris: Utopia, and Stellaris: Apocalypse for 26,97€ instead of 79,97€.
Meaning I may finally start playing that game here.