Not necessarily, given enough legal framework to support the action of nazi like groups, rich people (including billionaires) would become the target of other rich people or billionaires

Edit some historical context:

That’s what happened in Nazi Germany. The Jewish people were robbed of their wealth and priceless heirlooms. Not only that but the possessions of Jewish people were tallied up so that “wealth would not be stolen from the state”

See here: https://en.m.wikipedia.org/wiki/Nazi_plunder

Also happened with IP: https://blogs.loc.gov/copyright/2022/04/the-seizure-of-jewish-intellectual-property-ahead-of-world-war-ii/

In 1938, the Nazi government moved to hasten and complete the ‘Aryanisation of Jewish property’. In April a decree issued by Nazi leader Hermann Goering ordered Jews to compile and submit details of all private property valued at in excess of 5,000 Reichsmarks. Source https://alphahistory.com/holocaust/jewish-property-seizures/

A book for anyone interested in the subject https://www.cambridge.org/us/universitypress/subjects/history/twentieth-century-european-history/robbing-jews-confiscation-jewish-property-holocaust-19331945/