How safe to invest in Staking?

Investing, unexceptionably, is about trade-off. Between pragmatism and greed. Between risk and return.
Staking has its pros and cons and for me it is unpredictable if you gain profit from it. Just a friendly reminder, there's no such thing as safe in investing. every type of investments has its own risk.

Anyway, I highly encourage you to read this Medium blog then, evaluate it by your own: https://medium.com/kucoinexchange/staking-high-yield-and-risk-free-oh-you-wish-a339de452a6d