I’ve been using a vegan recipe for DIY soylent (Hacker School Soylent), and it is delicious. As a long-time flexitarian, it is nice to be able to reduce meat/egg/dairy consumption without having to think about it or make any kind of special commitment. I just substitute my soylent for a meal, and it is automatic.
Also, soy protein isolate appears to be a LOT cheaper than whey. Whey is probably good for animal rights anyway when it replaces other non-vegan options (since it is a waste product of cheesemaking, so eating it is not exactly increasing demand for milk production), but soy is probably better still since it does not put extra money in the hands of dairy farmers.
Anyone else interested in Soylent from the animal rights angle? I’m not saying it is the primary reason I am interested, but it seems like an intriguing side effect.