Ironically, just the threat of a wealth tax gets the wealthy spending money hiring canvassers who pay taxes.
Similarly, I'm rather convinced the reason 2010s technology giants became were bloated in order to deflect just how much cash their core products were generating. Google could have just run an advertising engine on a search platform and generated 90% margins. Instead, it expanded into various businesses, all of which significantly pulled that 90% margins closer to 10% margins, which avoids scrutiny.