Plastic utensils are typically made of two types of plastics: polypropylene and polystyrene.
Why is it not recyclable?
Since the manufacturers of these plastic cutlery do not label them, it is not possible to say what they are made of.
As recycling processors will not accept them, they are not recycled.
For all that, places that accept rubble like bricks and concrete would sometimes also accept ceramic waste to use it as raw material for roads and other constructions.
Use them in your garden to catch the water that drips from the plant pots.
Grow some small herbs directly in them.