This is reductive. The government should be involved in preventing practices that harm consumers. Some consumers would find that they can't help themselves from watching endless videos. And no, they should not be involved in whether it autoplays. They should be involved in allowing OPTIONS deciding whether it autoplays. This was just an example. Why should the government not help consumers who feel harmed in a way that would not impact others just because you wouldn't find a use for it?

"Out of curiosity, what do you think government should NOT be involved in?"

This is also a reductive. I have only named one area the government should be involved in. I am not a statist. There is a clear harm caused by certain practices which exploit the behavioural instincts of humans. I think there is enough harm to warrant government involvement to protect consumers.