Can you earn free money on Coinbase?

I've been hearing a lot about Coinbase and its supposed earning potential. I'm quite curious about this, can you earn free money on Coinbase? I've seen some posts online claiming that you can make some extra cash by simply signing up and doing some tasks. But is it really that simple? Or are there any hidden costs or conditions attached? I'd really appreciate it if you could give me a clear and concise answer to this question. After all, I don't want to waste my time and effort on something that isn't worth it. So, can you earn free money on Coinbase, or is it just another gimmick?