If you get paid in stock and properties, you absolutely have to pay taxes on it. Normal income tax, the same as on cash. Plenty of people who aren't billionaires get paid at least part of their salary in stock, e.g. pretty much everyone working in Silicon Valley. If salary is taxed at X%, and capital gains are taxed at Y%, you get taxed at X% at the moment you receive the stock (the entire value; regardless of how much it was worth at the time you were promised the stock), and then at Y% on the difference between the value at the time you received the stock and the time you sell it. If you know a legal way in which I can stop paying 51% tax on the stock part of my salary, I'd love to know, though.
Unless you mean already holding stock that increases in value, i.e. not getting paid at all. In this case, you pay capital gains tax when you actually sell that stock. If you never sell the stock, you don't pay the tax, but if you never sell the stock, you also never get any cash and it could be monopoly money.
The fact that so many people don't invest their money and just let it sit in their bank accounts is the worst tragedy. Taking the average savings rate (7% of disposable income pre-COVID; increased during COVID, but that's a temporary anomaly) and the median household income in US ($68,703 in 2019), you get around $400 monthly savings. If you put that into the stock market and just let it sit there in a S&P500 fund, you'll have a nice inflation-adjusted $1,000,000 in 40 years (actually slightly more than that). Alternatively, if you just let it sit in the bank account, you'll end up with inflation-adjusted $54,523 ($192,000 pre-inflation). Slightly more if you put it into a shitty deposit, like the 0.5%/year that my bank is trying to sell to me.
Of course, if you start trying to time the market, you'll just end up buying high and selling low, and losing most of your money.