Not a good way to handle left over balances, multidice. Many people have dormant accounts with balances > 0, I imagine.
Why? How would you handle this situation then? We said we will cover all leftover balances from our own pocket if users come and claim them, is that not good enough?
Well when Seketsuna and marcotheminer made their posts, I am afraid you hadn't said "we can cover that from our own pocket" yet.
Instead, you had only said "All coins left will be donated to developers." at that moment.
With your new clarification, it is definitely good enough IMO.