Alt-right billionaires don't depend on democracy, all other things being equal, they'd much prefer an oligarchy with them and their friends at the top, and it's why many of them want to steer towards it.

Throughout history, big business and the mega-rich have regularly backed coups and authoritarians, compared to their democratic alternatives. It's a much better system for them than one where each person gets one vote, because there's a lot more of us than there are of them[1].

As for sworn enemies of democracy, I think the guy who launched a coup, as part of a broader conspiracy to steal the election when he lost would be towards the top of the list.

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[1] When times get tough, in a democracy, it becomes difficult for them to justify why they get to take three quarters of the pie, while the rest of us fight over scraps.