As soon as that happens, they will declare those reusables unsafe for handling by them, and refuse to put your food into them. That’s what happened with reusable grocery bags. I clean mine frequently with disinfectant and sunlight and rotate them so they are clean, but that didn’t keep the grocery stores from refusing to touch them.
I’m talking about plastic bags and Styrofoam containers. People will simply buy them from Amazon or Uline and bring with them when they order takeout. This will actually save the restaurants money, another unintended consequence from liberalism.