If it's an open (unencrypted) network you don't even need to ARP spoof. Their MA...

Nextgrid on Feb 9, 2021 | parent | context | favorite | on: Change your MAC address with a shell script (2019)

If it's an open (unencrypted) network you don't even need to ARP spoof. Their MAC address will already be in cleartext in the packets - just start your interface in monitor mode on the proper channel and capture some traffic.