As I've a analyzed on length earlier, that's my bet, because it makes sense both strategically speaking, as well as economically speaking, ad the area east of the Bosporus, aka Bithynia, both can act as a bulwark against potential future Turkish aggression and protect Constantinople from it, but also fertile soil, but also IOTL it is Turkey's main industrial hub, its loss would propably see the Turkish industry dispersed throughout Anatolia, leading to far less efficiency, due to the horrible infrastructure that the Anatolian countryside has that they'd have to go through. Not only that, but it could possibly became Greece's 5th industrial area, after Athens, Constantinople, Smyrna & Thessaloniki in the future, whereas minerals & other resources taken as reparations by the Greek state pass from this area first, as the closest to Turkey, ending up in the hands of the enterpranually spirited Greeks from Egypt, mostly merchants but overall sharp businessmen, investing their wealth on manufacturing sector, thus driving urbanization in the entire Bithynian region, thus enabling the settlement of Prusa to grow back to an important city for Greece, in the span of 5 to 10 years.