Just to get this straight, in Germany if coca cola sells a can of coke to a consumer and that it is somehow returned to them through a deposit scheme or something they are legally bound to recycle entirely that aluminium foil ?

If that's the case that's amazing but in many countries in Europe a lot of effort is done to collect recyclable stuff but that certainly does not mean it will be recycled.

There is a vast difference between something being mandatory to put in the recycling bin and it actually being recycled for real.