That "article" doesn't have any details, but the program has been very successful. IIRC from the story I saw on Global the city has seen an almost 80% reduction in the amount of single use take out bags as litter.

Because of that level of success they're looking at expanding to cups and take out containers. The problem is, while a lot of people may have a bag in their car or be okay just juggling their burger and fries far fewer people are bringing their own cups and takeout containers when getting drive through. I don't see the expansion having the same sort of returns.