Wyze and iSmartAlarm both used the same hardware manufacture. It’s possible that the V1 Wyze cameras use the same MAC address as some of the iSmartAlarm cameras.
I don’t think Wyze re-branded iSmartAlarm’s hardware directly, the manufacturer probably sent the same type of cameras to both companies. The Wyze-specific MAC address probably didn’t come until the V2.
All this is only my speculation.