This is the main reason we see this insane investment into AI imo. If you imagine having lots of money, where should you invest that currently?
Housing market: Seems very overvalued (at least in germany). Also with the current uncertainty and inflation its hard to make an investment that pays back over 20-30 years. So building is also difficult.
Stocks are very volatile currently. Not only since Iran. To me it seems since the financial crisis 2008 investors don't enjoy stocks as before.
Gold: Only if you are paranoid about collapse of society. It doesn't make sense to invest into s.th. without interest rates.
Crypto: Same as gold, but better if you like gamling. I would assume most people who are very rich don't gamble with most of their fortune.