Tiny islands surrounding a huge country is land owned by another country. Land of another country creates an EEZ, such land belongs to Greece and therefore it is Greek. Sucks for Turkey I guess but Turkey isn't special and doesn't deserve special rules to get extra waters because it fucked up so hard as the Ottomans the minorities felt compelled to kick out the brutal regime that even in their dying days was comitting genocides so bad that their WW1 allies (Germany and Austria) turned around and said "Stop this shit."
If the Ottomans became an actual state that treated all their minorities as equals and became a federal state the modern country might still hold more than just anatolia and a bit of Thrace, thereby having more waters in their EEZ.