Hi Tim, thanks for the message.
Great question.
The passive income strategies in the article are all DeFi (Decentralized Finance). This means that you don't need to rely on a company and you keep custody of your crypto.
On the other hand, MEXC, Coinbase and Kucoin are centralized companies. Although they might offer passive income opportunities too, the disadvantage is that you give away the custody of your crypto. Although, exchanges went bankrupt in the past (see FTX and Mt. Gox).
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