Also TVs since 2000 in the US were all required to support v-chip which allowed parents to set restrictions on content. Getting around v-chip could often be somewhat complicated. Meanwhile it is usually pretty trivial to get around parental control software on computers.
My parents couldn't switch inputs on the TV, there's zero chance they could configure a v-chip without my help. Most of my friends' parents were the same way. I don't think this technology had the impact you think it had.
