Well that's what the yeast does, mostly. It eats broken down PET and creates fats and other stuff that is actually in food. They also state the process costs $60 per kg and we produce so much waste it cant be considered a solution to our trash crisis.

Read the article bro

Yes. I know we're fond of corn around these parts, but there aren't little plastic corn kernels in the microbial poo. Unprocessed plastic molecules would eventually get eaten by another organism in the vat.