In germany a lot of it was because of the success of Crytek with Crysis at the time. The first cryengine was mostly build by demoscene enthusiasts :) They gobbled up a lot of demoscene people and from Crytek they got scattered around the globe.
3DMark the benchmark by Futuremark is as the name suggests, made by ex Future Crew. The list goes on.
If you go around looking at where most demosceners from the past decade or two work today, you'll find the vast majority of them work at places like Unity, Unreal (Epic), etc.