Do people earn from buying unit trust?

Yes, many people have made profit from unit trust. Generally, this is done through comprehensive financial planning and portfolio management. In fact, I am regularly sharing the results of AIA Investment-linked funds here:

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AIA Singapore Investment Linked Fund Performance

In any case, every investment has its own set of investment risks.

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Types of Investment Risk that You should know

By knowing the risk that an investment entails, we will know how to manage the risk effectively.

I share quality content on estate planning and financial planning here.

Yes, there are. And there are people who fail/lose money as well. There are also people who make money from property, day trading, bitcoin, MLM, collect cardboard boxes. But that does not mean you should or should not go into these. I think the more important question is do you understand unit trusts, are you ok with the expected returns, the fund managers, volatility, fees etc etc and how it fits into your portfolio.

Hope this help.