> It's kind of like how all those sweeteners sold as being stevia are actually only like 1 or 2% stevia.
Sometimes they add filler to match the volume of sugar for equivalent sweetness. This makes it easier to proportion out for baking and adding to drinks. Otherwise the baking might be off or the drinks too sweet.
If I remember right, from the time I took a look at them, some didn't even have stevia at all. Their only relation was having a branding that made you think of stevia.
Sometimes they add filler to match the volume of sugar for equivalent sweetness. This makes it easier to proportion out for baking and adding to drinks. Otherwise the baking might be off or the drinks too sweet.