The only thing I find unfair (on what I understood) about the Digital Markets Act, it's how it looks like it was made to target Apple and only Apple Why I can'

The only thing I find unfair (on what I understood) about the Digital Markets Act, it's how it looks like it was made to target Apple and only Apple Why I can't install Steam on my Xbox or PS5? Since we are here talking about open market, we should not target one company but make it all open.