The claims that they were built by the slaves or voluntary labor are both wrong. They were built by levied labor. Think a military draft, but you’re performing general labor for the state instead of fighting. Yes, those on the work gangs were fed, housed, and paid while there. But they weren’t building pyramids of their own free will either. It was still conscripted and forced labor. After their term of service, the workers got to go home. But it was still forced labor.