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?
I’m with you on that one! Unfortunately that’s just not most people. The best thing would be is if they’d just give up options. Sell the cup as an optional thing or something.