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Most people who succeeded or became wealthy made it through investment or illegal activities. There are some lucky and smart people who bought Bitcoins in the early years when the price of Bitcoin was few cents or few dollars.
Btw the experience of becoming wealthy is different from country to country. I've heard that in ex-Soviet countries, people became rich by doing criminal activities, robbing the government, thanks to communism and doing some other bad things. In developed countries, I think that most of them became wealthy through innovations and using the opportunities to start a good business in the innovative niche, like the internet.
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.