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The important part of getting rich is not just how to get it, but protecting and hiding it. I agree that many people get rich in illegal ways, and therefore they also maintain it in the same way, hiding it from detection. People who get rich through other means also strive for the same goal, they learn to protect their wealth from paying large taxes. The current generation has an easier opportunity to get rich, by taking advantage of the developments on the Internet, especially social media. Becoming a content creator or influencer for example, by going viral, they have the potential to get rich suddenly.
Of course there are many ways to get rich regardless of whether they want to get rich cleanly or dirtyly. Corruptors get rich because of corruption - mafia gets rich because of their illegal business, some other people get rich because of their clean business and various other businesses. Content creators can get rich if they really work hard - as well as businessmen who are able to grow their business over time. But in my opinion - both will be able to multiply their money and protect it from inflation if they invest.
Investments have different purposes and some investors actually do it to fight inflation. They don't want to hold too much fiat - so the choice is to invest, regardless of which asset they think is profitable or safe in the long term.