No, seriously, why do they? It’s not like the construction workers don’t get paid their wages if they aren’t given such projects, and, unless you are buying the resources from overseas, the only cost for the construction materials for the state is wages/salaries of the workers who are involved in the relevant processes.
Am I being swindled?
If I’m not mistaken, the game is essentially about starting your own soviet republic under the USSR (and presumably handwaving away the idea of non-monetary cooperation between soviets) so yep, no pre-existing anything.