They already are, kind of. The far-righest presidential candidate who was bordering on fascist in France was bankrolled to absurd amounts by one of the richest assholes in France, Vincent Bolloré. Bankrolling a militia isn't a far stretch from bankrolling someone advocating for banning non-French names and expelling everyone of foreign descent.
They already have. US Billionaires are bankrolling white supremacists (https://www.exposedbycmd.org/2022/05/24/right-wing-families-...), Ukrainian billionaire Igor Kolomoisky started their own PMCs to get their oil (while fighting against Russia, sure, but it's still a PMC at the whim of a single man), Thiel and a whole bunch of SV rich kids are building post-apocalyptic shelters with their own, private security forces.
Anyone downvoting you is a fool. Billionaires are ready for war.
Think Proud Boys, but made respectable, the backing of a few senators and armed with top of the line hardware.
This is essentially what happened in Ukraine.