No. Apple never had a super-majority (or even a majority) of the smartphone marketshare, let alone in the EU where Symbian and BB historically held strong marketshares during iOS's tenure.

iOS's best has been 30~40% in some european country (not even EU-wide). Although it does capture the vast majority of profits, but that's not really relevant to antitrust-type cases.

I believe Samsung currently has a bigger share of the EU market than iOS. There never was a case of monopolistic abuse from apple in the EU, because they never came close to a monopoly.