I built an opener with an ESP8266. Cost five bucks, took a couple hours, no cloud, no drama. Thanks to Home Assistant and Homekit integration, anyone in the household can use it effortlessly.
I’ve had an IoTaWatt running for years without any issues. I’ve used it to pinpoint the exact time two refrigerator compressors failed. It’s been handy for all kinds of other stuff.
Additionally, anyone with a gift card is entitled to shop there without a membership.
I don’t see how the burden on cashiers is changed.