(57) [...]
What it basically says is that Apple has to create and enable competitors to create their own stores, use Apples hardware and software while providing free access to anyone who wants to compete with them.
There are multiple other sections of the DMA thats talk about fairness of competition and ability of gatekeepers to hold more power over the competitors which effectively results in no change of competition again illegal.
Anyway following months will be very interesting when EU Comission reviews what each Gatekeeper has sent over regarding their individual compliance changes.
If you're quoting point 57 in this regard, you don't understand the DMA. This point deals with something else. There are other parts of the DMA which are much more relevant.