It is not a waste of your time if you can avoid scammers. I had my doubts when I started 4 months ago, and I also had to deal with someone, the first person who contacted me here, who didn’t want to tell me what the job was about because he needed my phone number to explain everything in detail in a call. I told him that it was against TOS and never heard of him again. Then, when I got my first order I was really doubting if it was for real, because the buyer canceled the order saying that there was a problem with her colleagues. Then, she came back to me a week later saying that everything was solved and placed again an order. I thought the whole process was weird and was really doubting if I was wasting my time here. I thought for a moment that she was going to steal my job and never get paid for that, but the truth is that everything went fine and she even placed an order a second (third) time. My point is that it can be kind of scary at the beginning, but if you learn to “filter” your buyers, chances are that you will find really good and honest people that are willing to pay for your services.