Let's see: 2.36 kg of sugar makes enough syrup for 24L of OpenCola, according to the wiki article. So, 12oz of OpenCola contains 34.9 grams of sugar [1]. 4 grams less than the equivalent amount of Coke [2].
Not to say that this isn't still a lot of sugar, just that it's comparable to the product it's trying to emulate.
So while the concept of "OpenCola" is cool, it's closer to "OpenDiabetes".
[0] https://authoritynutrition.com/how-much-sugar-per-day/