"It has helped malicious actors during the 2016 U.S. presidential election and the Brexit referendum, arguably helping to subvert democratic institutions."
Wow, it seems clear to me that some people only respect democracy when they win. I don't like Brexit but if people in UK vote for it, let them be.
The malicious actors and those that try to subvert democracy are the billionaires that buy Media in order to propagate lies that at the current time remain unproven.
A tax on absolute income is a very dangerous thing in any gobertment. But we already have it, with inflation.