Earlier quoted context omitted.
> It is possible that the nutrient powder (and similar) industry hasn't given much thought to this idea because its radical and potentially risky, especially as a business venture where legal liability might be very, very high. The stuff bodybuilders consume is not as well controlled as anything called 'food'. In fact, bodybuilding forums are full of 'I bought brand X and it was mostly filler, better stick to brand Y…
That's simply not true. They have to list the nutrition info the same as any other food. Protein powders that are "mostly filler" are actually ~20% filler, not mostly. And the label makes that quite clear as it both lists the ingredients so you even know what they are using as filler, but also the nutrition info. If 30g of powder is only giving you 20g of protein, obviously there's 10g of something other than protein…
In other words, by declaring 'Soylent' as 'not food' he sidesteps lots of regulations and tests.