Because staking is a passive source of income, he should be not complaining that the rate is too low, given that he is making a profit. Investing in cryptocurrency is not easy because you will get scammed. Usually, you should get into the top 10 currencies because they are the best and, in my opinion, the safest to invest in. If he wants to invest in a new cryptocurrency, he should first read their website, whitepaper, roadmap, and also the community because you can easily distinguish what is scam and what is not.
Staking offers passive income, but it is very important to check how useful the project is, what products it offers and how useful it will be in future.
Blockchain technology can be used for different purposes, for example to safe the planet from climate change
https://twitter.com/ClimeToken/status/1498942071658405888And only you can choose what purpose is more suitable for investment.