I'm not aware of much specific risks from anodised aluminium cookware compared to plastics or other metals. The biggest risks of dissolution are acidic foods and wet food sitting in the pan, neither of which is an issue with coffee capsules.

Furthermore, the WHO estimates that one can safely ingest up to 50mg of aluminium per day and the FDA hasn't even bothered setting an upper limit, cooking a whole meal in aluminium pans may leach 1~2mg of aluminium in the food.

There are health risks to breathing aluminium dust, but most people aren't going to snort their coffee capsules.