
Apple AAPL.O shares trading flat after the iPhone maker submitted a legal challenge to the EU order to open its closed ecosystem to rivals
EU's Digital Markets Act aims to curb Big Tech's power; AAPL claims demands stifle innovation
Co argues interoperability rules pose privacy risks, target AAPL exclusively, affecting user experience
Legal battle expected to last years; AAPL must comply with EU order in meantime
AAPL stock down 20% YTD, underperforming Nasdaq .IXIC which fell 1%