Can motorized TV mounts be controlled by Alexa, Google Home or smart-home systems?

Not natively, in most cases. The mounts in this category ship with RF or IR remotes, not Wi-Fi. r/homeautomation and r/HomeKit threads in our signals show owners adding smart control by pairing the included remote with a Bond Bridge or Broadlink RM4 Pro IR/RF hub. If app or voice control matters to you, plan on buying that bridge separately.