This may be a stupid idea, but to my knowledge metals is are some of the best materials when it comes to being easily recyclable.
Ignoring the cost and reusability, wouldn’t recyclable disposable cups made of metal be a better deal than the largely incinerated plastic cups?
ah! my bad, they looked like aluminum so I assumed it was the same product. And you’re right, the aluminum ones don’t seem to be designed to be disposable either.