Maybe I put it this way: when you go outside to eat, you need to be paranoid, so you need to look around for the keto-compliant food. But, ya know, even if it is not obvious carb (rice/noodles/bread), there is some carb hidden in the food(sweet sauce/flour-coated/starchy gravy)
And if you ask a little bit more in detail for those foods, the staff will not be amused then.
Those good one might tolerate and try to answer as much as possible.
Those ignorant idiots will just say “it is all made like this. I also don’t know.”
Those not-so-good staff might start to nickname you in a mocking way next time you visit them, and before you think you can just bring your money elsewhere, think again: it is likely that the restaurant/stall is the one nearby that offered the lesser evil among all the available food options.
And let’s not talk about those ****** who gives ****** attitude and scolded people off once one decided to ask a little bit of questions.