Billionaires aren't a monolithic block though (beyond core issues like low taxes). If you sell out your country, then other oligarchs can use that as an excuse to order their pet politicians to confiscate your fiefs^H assets. Just see all the speculation about nationalizing SpaceX in this discussion.

The only way money can protect you is if you literally buy out the entire government, in which case you're basically a monarch.

But yes, that is cold comfort to us plebians.