A micro-business (no loans, no employees, no long-term real estate leases) diversifies income across multiple clients. Owning several reduces the risk of getting bored because you get to use multiple skills sets with different seasonal cycles.
For example, in March, everything hit the fan at the same time: people's jobs, their leveraged homes, their stocks, the credit risks and illiquidity in corporate bonds and insurance products, and unanticipated health risks.