Not sure how this is any better than a good composting toilet set up. Grew up with one in the house (hippy parents) and it doesn't smell and is minimal maintenance. Not sure how well this would translate into an urban setting but that seems like a solvable problem (and a better approach than a subscription based service like this one).
https://en.wikipedia.org/wiki/Composting_toilet
https://www.researchgate.net/publication/258852961_Compostin...