I mostly see them used for 1/2-gallon milk and small juice containers in the U.S. I’m in Canada right now and see them being used a lot for large juice containers also. I could see glass used for those (as they were in the past) but with the higher risk of breakage it’s not as ideal, but have a harder time picturing aluminum being used for milk and at least some of the more acidic juices. Does aluminum work with those beverages?
You seem informed on the subject: I’ve recently seen aluminum single-use cups advertised, targeting the same market as red plastic cups commonly seen at picnics. Those plastic cups are rarely recyclable, so I’m assuming the aluminum kind are more eco-friendly assuming they get recycled, even with high energy usage?
They’re marketed as being recyclable along with the cans that might appear at a picnic. Whether they actually get recycled is another question; I’ve seen more picnic shelters with recycling bins, but certainly not all.
Some buyers in their online reviews said they were washing and reusing the cups instead of recycling them. I don’t know how effective that is but assume it’s fine. They would be a better choice than glass at places like pools where glass is prohibited.