Fake construction (and from what I can see, probably all similar bases of its kind).
Look at the photo to see how thin the metal joints are between the plastic corners provided by the manufacturer and what I replaced them with.

Meanwhile, the manufacturer didn't even bother to open some holes in various places with the option of certain positions to securely screw in the screws. So, the screws are just there to press the metal frame and hold it only with that pressure (which, by the way, distorts the metal so thin it is, just with the pressure of the screw).

The only good thing it has is that the plastic corners with the wheels seem quite sturdy, so I was able to pass my own really sturdy metal supports through them. If you do the same, it's fine, otherwise, I wouldn't trust the construction at all and it would go for a return.

(I thought for a moment about giving it a second star because of the lower price, since the "competition" is more or less the same mess, but still, such a mess...)