Everyone here has had moments where they need to eat something because they're hungry, but are in the middle of something, a team meeting, in the zone fixing a bug, or just up late at night. The standard solutions are to either be distracted by hunger and keep working, or go eat something junk-like real fast, or prepare super well in advance a series of healthy snacks meant for times like this.
Well, not everyone prioritizes organizing emergency meals, or enjoys cooking, or wants to spend time on it. But they still value eating something cost-effective, and at least moderately healthy. For all the people whose default choice is ordering pizza or ringing up Postmates for some junk food, Soylent (while not making people sick) is several orders of magnitude better in terms of cost, convenience AND nutrition.
What's wrong with that? Why would you diss that choice so much? Surely you can't believe ordering a Domino's cheese pizza is better than consuming a bottle of Soylent? If your only suggestion is "they should learn to cook/mix their own/pay attention to food" you're missing the point and refusing to empathize. Different people have different priorities and inclinations, and it makes sense for products to be marketed for some set of those without demanding behaviour change.