Wow, This is the first article I’ve ever read that 1. didn’t offer up filling out surveys as a serious way to earn extra cash, and 2. said everything I’ve ever thought about surveys as a side hustle. I don’t know why people keep suggesting this, when as you point out, there are much better side hustles to score serious cash more efficiently. WELL DONE! ;)
The point of each survey is to present you with a topic you're interested in and qualified to discuss for the benefit of the researcher. Surveys range in time required, from very short to quite long. Because researchers are looking for opinions only from certain segments of people, you may find you have to try a few surveys before you're qualified to give your opinion on one. Keep at it, and you'll eventually find one that's right up your alley.