Perhas where the ICP idea possibly came from is by trying to minimise a new childminder's start up costs. If you only have one or two mindies, the parent's car seats can be stored in the cms car. As the cm's business grows and more mindies are enrolled the cm's finances should be a bit healthier and it becomes more practical for the cm to provide the seats.
Just wonder if the ICP course now includes a lesson on how to check a car seat fits in your car safely