People really are prepared to overlook all sorts in their pursuit of cheap stuff.
Companies which retail in the UK like B&M, Argos, supermarkets, Primark all have a legal obligation to make sure the products they sell are safe and conform to UK standards. Irrespective of where the products are made. They have to make sure the items are not made using dangerous/banned chemicals, that toys don't have eyes which will fall out, and that paint does not contain lead. If they are found to be selling stuff which does not come up to standards then it is withdrawn, they issue a recall notice, and depending on where fault lies, they are fined.
This gives you a level of safety and security when buying from a UK retailer, whether in person or online.
You get none of that when buying from Temu. They don't care about lead in paint or eyes which will come off toys and choke your toddler.
From a US newspaper yesterday: MISSOULA, Mont. — New this morning — hundreds of multi-purpose helmets sold on Temu are being recalled over a serious safety risk. The Consumer Product Safety Commission says “Fouabeaka” and “Geniuss” brand helmets fail to meet federal safety standards and may not protect riders during a crash.
From the Irish authorities a fortnight ago: A safety issue has been identified with a Childrens Fancy Dress Costume sold by FATIN Kids on the TEMU platform. The risk reported to the CCPC is chemical, arising from excessive migration of chromium (VI) from the textile label. Chromium (VI) is a sensitising substance and may cause adverse health effects in children.
But hey, it's cheap.