Powerful, but also dangerous. Imagine that individual being someone who is unsure who to vote for at the next election - times a few million. A limited version

Powerful, but also dangerous. Imagine that individual being someone who is unsure who to vote for at the next election - times a few million. A limited version of that is what basically decided the 2019 UK elections. And it's also mostly immune to regulation, as it's nearly impossible to prove that such a campaign has actually happened.