As a designer, I just want to say that if your instinct is to rag on these symbols for being incomprehensible, go ahead and try your hand at one or two. It may be humbling.

Illustrating abstract concepts that are similar to other, related abstract concepts is extremely difficult. Remember that it's got to be legible in a footprint of a couple dozen pixels on a side. When you're done, make sure it isn't close enough to any other AWS product symbols that customers would get confused. Also, run it by a committee of people who aren't designers, and are proud of that fact. If they are in a senior position, attempt to integrate their feedback, no matter how idiotic, into your design, because nobody's going to fight for a little thing like an icon symbol.

I stopped making logos, it's a really difficult and thankless job. Designing apps for complex use cases is way simpler.