People still believe earth is flat, Trump won, govt employees in Pentagon using TikTok, Trump refusing to use secured phone initially, QAnon, etc and you are asking if espionage is possible in this modern world. Your phone itself is a spy. A "spy" can literally inject virus and siphon so much data. Also espionage is not done MI, JB style. Most real world espionage is so dormant and slow, mostly observing and collecting information and passing on.