If you have to bring your own shopping bags and grocery bags, you should have to bring your own cup to Starbucks.
Oh, wait, they don’t want all those germs crawling off personal cups? Those same germs and more crawl out of nasty grocery bags.
There was a story a few years back that some family got botulism poisoning from using their own reusable grocery bags over and over and not washing them. ..........................
How about if nobody goes to restaurants & we all drink coffee at home.
Most of the time, we use our insulated mugs for both hot and cold beverages.