There are good things that Suppli as a eco-friendly business intends to make happen, but ultimately I think there are some realities that ruin my impression of them. I have serious doubts that they even move the needle that they claim to.
For starters, I don't like the implicit guilt they place on consumers - that it's somehow us who'll make the biggest difference in waste-reduction. Consumers pay for their "service", yet they have to return the containers under a threat of an annoyingly exorbitant penalty.
The manipulation leaves a poor taste (heh) - we're paying hoping for a better ecological outcome, and at the same time doing the grunt work of rinsing and returning the containers manually. This is like "leasing" a reusable straw.
For waste reduction, you have to target the 56 companies that account for half the global plastic pollution. But Suppli is not powerful enough to target them, so they make us think they're doing us a favor, by making us do the lifting in their value proposition, targeted to us.