Just Salad in New York City has a reusable bowl program that has made me return a bunch of times to avoid single use plastic. You pay $1 for the bowl, and each time you bring it back you get free toppings.
https://www.plasticstoday.com/packaging/just-salad-s-reusabl...
The hygiene part is rather interesting. The people working with the food are not allowed to touch your bowl with their gloved hands, and your bowl can’t touch anything behind the counter. They set a plate on the counter that you set your bowl on, and then they grab the plate and steady your bowl with tongs that they clean after each salad they make anyway. Going back to reusable in restaurant settings would require thinking about the hygiene of those reusables.