[Alupis]

> As soon as this is materially cheaper than meat it will become the 'filler' used on so many burgers, taco places etc. and they'll do it without telling customers.

This already exists. Tofu is commonly used in fast food as a meat "filler", and very few people notice as it is. Tacos at Jack in the Box "May Contain Soy Products", and more.

Making "Impossible Meat" is always going to be more expensive than Tofu fillers, simply because it's processed to a much higher degree and requires a lot of ingredients.