Send them to India, they’ll figure out what to do with them.
In the lower picture you posted you can see gear teeth in the base of the blades. Each blade has a motor that adjusts the pitch of the blade independently, the bearing is about five foot in diameter and the race is just a stamped piece of sheet metal. When the race wears out it slices through the grease seal and grease get spread over a large area.
It's not very environmentally friendly.