You underestimate the power of "defaults". Also one should question Apple why they don't ship Safari on Windows/Linux. They have all the resources available if they care. EU regulates and Apple is here to blame. Protecting their revenues (WebKit). It's only surprising it took this long to regulate. On the other hand US government is laughable at not doing any pro-consumer choices and getting bribes/sudden turns etc. EU here is leading here (protecting customers instead of companies)

#1, not if the EU does some action also against Google's monopoly, similar to how in the US Microsoft was almost split to 2 companies for the same reason

Safari used to have a Windows version but it was so underused Apple canned it.