It was discovered that SmartTVs by the vendor LG do not only send excessive telemetry data to their central servers but go a step further and even include data obtained from USB devices connected to the SmartTV.
source: https://doctorbeet.blogspot.com/2013/11/lg-smart-tvs-logging-usb-filenames-and.html?m=1
archived source: https://wellthissucks.xyz/2013/11/18/lg-smart-tvs-logging-usb-filenames-and-viewing-info-to-lg-servers-archived-source/