Could even just be their policy to try that all the time (or some random % of the time) and just back down any time a customer pushes back. Which is fucked up, but they might have never actually fought you on it because it was just meant to get free money from those who wouldn't push back and just pay it.
Contact with anything will result in trace material being exchanged. It's not acutely dangerous but could be contributing to the buildup of microplastics inside us. I donated the ones I had rather than junk them so that someone who disagrees can still use them, plus I'm aware restaurants still use them, but at this point I'm trying to minimize the amount of plastics that contact my food. Which also involves avoiding plastic utensils while cooking. I've got a mix of metal and wooden utensils, avoiding teflon means I can use the metal ones whenever, too.