You never know with this stuff, but generally speaking the farther from the cheapest, most jellybean parts imaginable you get, the sketchier the cheap no name Amazon/eBay/Aliexpress parts become. Things like the small signal BJTs, ceramic and maybe polyester caps, resistors, diodes, etc. are typically fit for hobby use at least, but outside of that you see a lot of parts that are recycled, remarked to higher spec, dumpster dived defects, totally fake, etc. I'd at least go to LCSC for electrolytic caps you can trust farther than you can throw.
IDK about the SMD ones, but I know the leaded assortments are known to not even meet their voltage ratings.