Caleb,
I definitely didn’t even think of USB skimming, That made me think of things like ATM or Gas pump skimmers, which actually happened in our home gas station. Estimated the stole roughly 275 thousand dollars. A bit off topic, but I think its a fair comparison and similar situations.
The Malicious mobile apps, is something I have to do very often with my son. While I have parental controls and other things to minimize what he can do. I can still see a lot of ways it could still be infected. For example, my wife not realizing as much as I do about the tech world, and allowing a download of something that shouldn’t have been.
Overall I really like the way you summarized everything into main points. I think you made a great post.