Good point. Cleaning toilets is a skill that could be trained into
them. When they go back, it will be a useless skill, because
installing and maintaining toilets is a skill that they are not
capable of mastering.
In Sub-Saharan Africa, missionaries dig wells for the locals, and come
back to find the wells fouled, unused, destroyed. Wells are too
high-tech for the Sub-Saharans: if given a hole in the ground with
water at the bottom, they are unable to maintain it.