It's all good fun when it's subject matter for a Big Clive teardown, or you're going to take it apart for a project, but it's alarming to think that people buy this stuff and use the Chinesium power supplies uncritically. I've bought a fair amount of stuff from AliExpress over the years, and you start to get a bit of a spidey sense for differentiating "legitimate niche product" (usually sub-assemblies for industrial/hobbyist use), "knock-offs which may have quality control issues" (pay particular attention to tolerances and the quality of any plastics used) and "mainstream tat" (avoid other than for Big Clive purposes). Certainly don't buy a [
cheap shitty pink] USB charger or mains-powered Christmas lights from eBay.
"Buy it in a physical shop." is a good rule of thumb. Even Poundland stuff seems properly engineered (at least from a safety perspective). Stuff sold by Amazon themselves seems okay, but the search returns all sorts of dubious rubbish from marketplace sellers.