...why anyone would buy plastic foundation, it does not recycle once contaminated...
I did it. And it saved my beekeeping business. Because the wax got contaminated with stearin and paraffin and god knows what else. I don't know it. Bee larvae died on my wax foundations. In Europe a lot of wax is contaminated with bee brood killing substances. I couldn't buy any wax without risking my operation again. I switched to plastic foundation and replaced all wax combs. I mean ALL combs in all of my hives. A brutal work. Costly. But it saved my darn as s. Bees recovered quickly, once they were off the contaminated combs.
I don't think plastic foundation is the way to go for the future. But please don't think you are on the safer side when using beeswax only. Contaminants build up in wax as it does in plastic.
So in future we cannot recycle neither wax nor plastic. All of it will and does hold huge amounts of "stuff". All you can do, is to make a lot of candles. Make the wax go one way, not cycling it. Burn it. If this strategy will last in the future is most doubtable.
Side note 1: Isn't it sort of "funny", that Bayer invented a wax cleaning process to filter out all the pesticides out of beeswax?! They already build such a system in Germany. Beeswax gets heated up, pressurized to high pressure and trickled through active char coal. Wow, you get so clean beeswax, hooray...
Side note 2: I already warned you repeatedly, that there are new pesticides coming or already in use, that will kill insects in the larvae phase. And this stuff is fat soluble. Again: fat soluble. Kills larvae. Hmmm...beeswax, fat soluble...hmmm.... 1 + 1 = ?