If it were based on interest, this is unlikely to be a problem unless interests rated exceeded tax rates.
The real issue is that most of the net worth is equity. These unrealized gains are not taxed. In some cases, a lot of the value is driven by speculation and not actually tied to the current profits of the company. This is why wealth taxes are brought up, or at least changes to capital gains taxes.
"As a society, we should prevent "escape capital" to be a thing."
This assumes that the ultrawealthy do not serve a purpose. Yeah, taxes should be increased on the top end, but probably not to the point of completwly eliminating the ultrawealthy. These people tend to use thier capital to fund other ventures. This can be important to startups and other organizations. Oftentimes they donate large amounts of money to charities or start charities in areas the government has neglected. There are alternatives to these, but I'm not convinced they are actually better. I think we just need to tweak capital gains tax on the ultrawealthy.