Temu are a new company which is flooding the internet with impossibly cheap offers at the moment, in an attempt to buy themselves a place in the online market. I predict that their prices will zoom up in the near future. I have no idea of the quality of the goods, but whatever it is like now, it will probably zoom DOWN to balance the rising prices.
Have you ever been at a market stall where an eloquent salesman is doing his salespitch? He starts with a few items that are far below the right price for their quality, waves each at the audience while praising them highly and and does the "I am not asking you for £10. I am not asking for £5, not even for £3. Ladies and gentlemen, I only ask you for £1 for this (whatever) but these are the last 10 sets, so I am afraid it is first come first serve. . . " and at that cue his shills, planted in the audience, come forward with their £1 notes to claim the "last 10 sets".
The effect of seeing this is to loosen up the resistance of the audience to step forward and buy. Next he brings out other goods - the first examples are good quality and a good price, He (apparently) is a good guy who sells quality items at knock-down prices.
Once his "last remaining" excellent value examples are gone to eager buyers, he falls back on mediocre stuff no different and no better value than what other traders around him are selling - but by then his crowd are in the mood to spend money buying from this "bargain stall".