How exactly does time limited slavery help with the culture?
What stops this labour being used in corrupt or self serving fashions just as the money is?
What stops this labour being used in corrupt or self serving fashions just as the money is?
The ancient Incan Empire collected taxes in labor (basically part-time slavery, everyone had to do their 2 months a year or so), and they managed to build enormous infrastructure across the Andes in just a few decades. And in high quality. Many of the roads can still be seen, 500 years after they were built.
How did they prevent capture of this labor by corrupt local officials? I don't know.
What stops anyone from using a kitchen knife to stab someone to death?
If you look at it that way, you'll get nothing done.