Aliexpress my impression is you can get "useful" stuff that are odd but usable. But I've had the impression that temu and shein was all "direct to garbage" devices, was this not the case?
I assume they made a similar change.
Shein is in reality just an aliexpress/baba wrapper, but they put huge amounts of effort into accurate sizing charts for their clothing, and their customer reviews system actively incentivises buyers to upload pictures of themselves wearing the purchased clothing. So as a potential buyer you can actually see the piece of clothing being worn by someone with a similar body shape than your own.
My impression of temu is they are trying to be as misleading as possible with their listings, and the value for money is absolutely terrible because of that: you think you are getting a 6' xmas tree for $20, but when it arrives it's 6".
There's no "Summer" or "Winter" season clothes. They just update them continually.
Few years ago there was a trend in online ads showing t-shirts and hoodies with "realistic" print ons of animals, optical illusions, mazes, etc. Realistic only on photos or rather renderings. Felt like some form of brainrot. It was all Chinese clone shops or outright scams. Luckily the trend is dead now.