As someone who works in Embedded Firmware and integrates WiFi modules: Regulatory Domain or RegDom is usually related to radio emission settings. Each country h

As someone who works in Embedded Firmware and integrates WiFi modules: Regulatory Domain or RegDom is usually related to radio emission settings. Each country has certain (subtly different) laws about which radio frequency may or may not be used for WiFi transmissions. The firmware and software has to comply with the regulation. This is why it need to know your location (some devices are also hardcoded to the country they're sold in).