Earlier quoted context omitted.
I had bad reviews been supressed by amazon several as well, so at this point I'm assuming any review system is theater.
Amazon definitely don't do anything like this.
If you choose a star rating below five, Temu asks if you'd like to request a refund or seek other assistance. The one time I said yes -- it was a keyboard where a shift key wouldn't trigger consistently at the peculiar angle that my typing style hit it at -- it immediately gave me a 100% refund and said just keep it.
But I've left other low-star rating without trouble. The refund/assistance suggestion is an entirely optional sidetrack.