Anything they do with any radio frequency must be publicly declared. 5Ghz is primarily reserved for Wi-Fi. I’d need to research to discover if any other protocols are approved to use it.
I thought the 2.4 and 5 GHz bands are largely unlicensed industrial, scientific, and medical bands and don't require regulatory approval. Wi-Fi must compete with other devices in those frequencies and tolerate the interference from other things.
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