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What in the world would a waiter or a doorman be using this for while on the job? Also, you are already being filmed at the restaurant, or the theater entrance. If you enter someone's property they don't need your permission to film you.

> If you enter someone's property they don't need your permission to film you.

Not particularly relevant to the question here, but worth mentioning that there are exceptions for places with an expectation of privacy, such as bathrooms and lodging rentals (hotel rooms, interior space of an Airbnb, etc.).

Show a "I don't want to be filmed" sentence encoded in a QR code on your t-shirt and enforce legally that unless you a specific license you have to shut your camera.

Aka real-life "do not track" header ?

I would leave that restaurant and not enter that theater.