I feel like you should read about systems thinking. You're ignoring so many potential side effects, so much history, so many statistics, incentives, human psychology. The idea of capping wealth in order to try to prevent certain power imbalances like sex trafficking, is similar to firebombing your house to fix a leaky pipe. Not only would it mess up a ton of stuff, but it wouldn't even fix the problem.
The idea of capping wealth is to cap power imbalance, without power imbalance many things would not be able to happen within a system, alas there are as you say many potential side effects, implementations of how a cap could work would have to be discussed by society, right now I do feel people are very mad about inequality as is, what solutions are there for it?
