In the past, most business owners would perhaps quietly donate to a party or candidates, but probably wouldn't hang their ideology out in front of people all day, every day. Think about someone like Warren Buffett. He has political views, but they are not something he's out there loudly airing on a huge platform.

And like I pointed out, these are not just any old "political views". It's extremist stuff that in the past would have gotten you ostracized. I'm old enough to remember Trent Lott losing his Senate leadership position, for instance.

Also, because of "network effects", simply providing content to Twitter makes the site more valuable.