These folks recently did tests on major TV brands, not accepting the on-device consent forms, and then recording how much data they continued to send after consent was denied (which itself is not always possible). https://www.youtube.com/watch?v=t_GK06_3UY8
Samsung was the single brand reviewed which actually stopped sending data after the user told it to do so.
Samsung was the single brand reviewed which actually stopped sending data after the user told it to do so.