I doubt it. All of the flavorings on their website, whether they're 1 shots or not, are sold to people who use them for baking, candy making, etc., too, just like the ones sold by BCF, LB, Wizard Labs, etc. I even use some of their 1 shots to make shaved ice syrup. Their Margarita is especially a favorite of adults.
Just to possibly clarify my earlier wording...her husband works on developing each of the 1-shots (the actual recipe for each one). They're then made in quantity for them by a manufacturer and delivered to OSDIY. Kim and her husband then split them up into the smaller bottles sold on their website.