Have you ever tried to sue a no-name Chinese manufacturer for anything? There's a reason they don't put a brand name on their stuff, or don't bother to register any name they do use, because it will be changed frequently anyway.
I had a 2 Molex-to-PCIe 6-pin power adapter catch fire, and discovered approximately 27 gauge copper-clad wire in it. They had bothered to make two colors of special 27 gauge wire with extra-thick insulation and print 18AWG on it just to save a few cents, making their product unfit for purpose.
It's not just the adapter that is the problem but bad SATA power plugs in general which can even appear on PSUs--there is less than 1mm of plastic separating power and ground on even a good molded SATA power connector so if it's badly made or the kind with removable pins there will be even less plastic in-between (or lower-quality, somewhat conductive plastic) which can easily burn up.
In your case you don't even need any adapter but just to cut the orange 3.3v wires from your current SATA plugs. The PSU is likely out of warranty anyway since they've changed to following the newer SATA standard for more than 5 years now.