Google needs Mozilla though - Firefox is the last remaining Chromium competitor Google can use as a counterargument against claims about their de facto monopoly.
Firefox has already lost years ago and is so useless to counter Chrome that they have to be funded by Google in order to survive. Mozilla's competitiveness for Firefox is close to zero.
The EU Digital Markets Act will just further solidify Chrome's dominance.
Safari isn't available on platforms other than Apple's (which have a minority share of computing devices on the market), so it's obviously not an actual competitor to Chromium based browsers.