> automatically sort plastic both by type and color, which is quite impressive

.... I am sorry, but how can that impress you? That would be impressive in 1990. Today, with deep learning and all AI, I would consider having robots open trash bags and sort whatever is inside for more processing (e.g. organic waste, plastic and so on, depending on how dirty it is) only slightly impressive. Unlike Amazon pick up challange, they don't need to be perfect.