> time to regulate large platforms like utilities

Sure.

> You cannot cut someone's power because they broadcast a death threat from their house

Uh... are you sure you understand what it means for something to be a utility?

Governments and police can absolutely cut power to your house if you hole up inside and broadcast death threats. They've done so for far less [1] [2].

[1] https://www.providencejournal.com/news/20160928/electricity-...

[2] https://www.cbsnews.com/news/los-angeles-shut-off-water-powe...