Additionally, negatively-biased phrasing on a public survey could also attract mostly those with negative views. This would skew your sample even further than solely priming.
With that said, I have no idea what any of those icons are.
Just from my own experience, I have used the overwhelming majority of these services and even worked at Amazon for several years and I could not answer more than a couple of those questions. The icons are so divorced from any real world meaning that when I make systems diagrams in Lucid Charts I use the AWS icons to represent abstract systems rather than the real AWS-specific meaning.
I also think the quiz is to prove a point. Those icons are not helpful at all. The opposite of the MS Office icons which are so recognizable all other office suites copied the color scheme.
Amazon badly needs some serious UX power...
It wouldn't be a very sustainable business, but you could make good money selling a chrome extension that cleans up AWS similar to what Reddit Enhancement Suite does.
Also, presenting options such as "dried arterial blood red" and "slightly but not too radioactive green" might also make you less likely to put in effort to select the real one, rather than just picking randomly.
Admittedly, I can't use them to identify any specific services, but they're cool looking.