This would be useful if there was an API to dynamically setup the guest network (for example with a password that changes every week or something). Some routers might have that.
Otherwise, besides the novelty, I don't see a practical case when this solution might be better than a printed QR code?
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[ 3.2 ms ] story [ 20.3 ms ] threadI used a Raspberry Pi Pico with a screen to join a Wi-Fi network with style :)
Detailed instructions and a few tricks available at https://github.com/predmijat/qr_wifi
I hope you like it!
Otherwise, besides the novelty, I don't see a practical case when this solution might be better than a printed QR code?