As much as we might not want to "give" away any of our time, when you're a self-employed individual, you often need to in order to reap new business, enhance old, or do your own market research to see what's going on in your field. Not all of your time is going to be billable. That being said, if you don't want to do surveys, I get it. But to the principle of the thing, it's a little disconcerting (maybe only to me) that many SE individuals seem unwilling to spend a few minutes of uncompensated time. In most other areas, that wouldn't fly. Then again, I guess mystery shopping isn't exactly like other self-employment businesses. But in many ways it is. If you want to build your business, you spend some unpaid time doing it. That doesn't apply to this survey, but I'm thinking of this in principle, not hard terms.
I learn something new every day, but not everyday!
I've learned to never trust spell-check or my phone's auto-fill feature.