Nadziad, these very cheap LCA are machined out from a single block of aluminium. The problem with machining out a part from a single piece of ALU block is that the block itself is made out of casting process and there are micro voids/cracks in them because in casting process the molecules is held together by mechanical adhesion only they are not interlock together. That's why the parts can be so damn cheap.
Take example, cast aluminium wheels. very easy to bend, crack if hit potholes or put under very extreme stress.
If you want the part to be strong you need to use forging process to make it but it's going to cost you more. That's why you see Skunk2 make their LCA with forging process. The molecules are interlock together through forging process. That's the reason why those original Rays, Work, Enkei rims from Japan is so damn expensive because they are forged instead of cast.
However if they make the LCA from material grade 6061-T4 or T6 then it's different because they went trough heat treatment.