The recycling processes for these products is newer and therefore less efficient (more costly) as it hasn't had the same time the older processes have had to mature + optimize
To add to this point. A couple of plastic recyclers in my country just went out of business because oil has been made so cheap recently that they are simply priced out of the plastics market. According to interviews with the founders, in the oil and plastics game there is a sense of having to freeze out these new entrants to the market for a little while.
