I wonder if the people who are known to be rich today didn't do any of those things you are mentioning. You talk about not getting married because your wealth can be split for a nasty divorce but you forgot that there is PreNap if you have trust issues. The laws are there to ensure people live together in harmony. Its a simple case of you can't eat your cake and have it. When you get married to someone in your youth, she was the bride at the time and now something happen and you guys decides its not going to work again, then it makes sense for both parties to compensate each other because it is believed that the wealth came when they were together.
Except you want to be wealthy and continue to live in holes for the rest of your life, pay for things using cash, have your own airline or airstrip, your standby medical teams, I don't know how you can successfully avoid the authorities in all of these.
Ten years ago, I would have expected everyone to wonder how one can dont pay taxes, dont get married, dont use bank, dont invest and dont get a job. Ten years later, I think I had changed my mind, I wonder how many people would ask the same questions, how to not get a job? Tldr: Internet.