That particular scam has been around for over a decade lol- long before Temu even existed...
They send those emails out by the millions- I got the first one back about 2017- when the only thing I had that went online was a old XP tower system- which didn't even HAVE a camera...
Scam alert! Don’t fall for this webcam extortion ploy (from 2018!!!)
The Temu app itself doesn't 'send stuff back' (nothing more than Amazon's does) but it certainly tends to be the marketplace of choice for those selling manufacturers seconds etc- so you will be getting exactly what you paid for...
Ebay is certainly no better, 90% of the new stuff sold on there is 'middlemen'- they buy from Aliexpress/Alibaba, double the price (or more) and sell it on Ebay lol- I know because I often see stuff on Ebay I recognise from Aliexpress for a LOT cheaper- but you have to buy it in 'bulk lots' of (depending on the items involved) by the dozens to the thousands at a time...
(I buy LEDs etc on Aliexpress- a bag of 1000 costs about the same as a bag of 100 on Ebay, or a bag of ten from DSE/Altronics etc...)
:-O