Earlier quoted context omitted.
Because big tech companies are now at the point where they can pick the winners in democratic elections, if they choose to do so.
Really? Doesn't seem like it worked out well for them during the last elections, given that people like Dustin Moskowitz and Larry Page were directly supporting and assisting the DNC campaign (with others assisting the campaign less directly).
If they haven't done it (yet), it's only because they've decided not to (so far).