But if you search for "USB charger", you need to prepare yourself for pages upon pages of identical-looking chargers from "Amoner", "RAVpower", "iSmart", "Ailkin", "Anker", "Power7", "Nekmit", etc.
And most of them have hundreds or thousands of 4/5-star reviews, most of them compensated in some form or another, so good luck trying to separate the wheat from the chaff.
For about half the things I search for on Amazon, it's a similar situation.
That said, your point still stands. These are not household names in the North American market, and it's not immediately obvious what is a legitimate and reliable option vs. a throw-away brand selling imported fire hazards.
[1] https://www.samsclub.com/p/anker-6-port-qc-blk-spring2017/pr...
RAVpower is actually a pretty good maker, with some pretty unique offerings (RP-PB19 is a USB UPS which takes in USB!). They even have an informative blog staffed with support personnel who reply to comments.