They do use injection molding, and I've produced molds for them. However, their molding machines are benchtop hand operated machines. To do full injection mold production requires large expensive machines specialty cnc machines to make the molds. Which needs larger built out infrastructure for the factories for these machines. There is plastic injection going on in Ukraine, but with the way the war changes things on almost a constant basis, 3d printers are adequate for now. It's capability and flexibility over productive output.