Most "monk fruit" sweetener I've seen actually has erythritol as the main ingredient, which just a small amount of monk fruit. Presumably this is to get away with calling it "monk fruit sweetener" which appeals to the idea that it's somehow a more "natural" product.
Monkfruit is "300x sweeter than sugar." I have no idea how they measure this. I've never tasted monkfruit or an undiluted extract. They mix it in with erythritol to try and match the sweetness and appearance of sugar.
