[computerphage]

Prion disease has a case-fatality rate of 100%. That's not an estimate or approximation and it's not rounded up. They are also untreatable.

There are only five well studied prion diseases (because of their rarity). Two are exclusively heritable: fatal-familial insomnia and Gerstmann–Sträussler–Scheinker syndrome. One, Kuru, is transmitted via cannibalism.

The incubation times are extremely long. Some estimates for Kuru go up to 20-50 years.

The most prevalent form of prion disease in humans is new variant Creutzfeldt–Jakob disease (nvCJD) or Human Mad Cow which has a lag of about 10 years based on CDC data. It is transmitted by eating tainted beef products. Let me stress that this is extremely rare: there have been 3 confirmed cases in the United States.

It is extremely unlikely that Soylent is a vector for prion disease, especially since it's been vegan since version 1.2 and never contained beef as an ingredient. Even if it somehow contained tainted beef, given that it's been available for less than 3 years, it's extremely unlikely that any cases of nvCJD (of which there have only a few in the last decade) or any other cases of prion disease were caused by Soylent.

There is good reason to question the safety of Soylent given its record but "prion disease rumors circulating on Twitter" are utterly ridiculous.