How to make free money with Coinbase?

I'm curious, can you elaborate on the idea of making free money with Coinbase? Is this a legitimate strategy or just a misconception? If it's genuine, what specific steps or conditions need to be met in order to achieve this? I'd like to hear more about the potential risks and limitations involved as well. Ultimately, I'm interested in understanding whether this approach is sustainable and worthwhile for individuals looking to grow their cryptocurrency portfolio.