No, the app is just a map of the hotspots.

Well... Let's open an etymological dictionary to see that this word is of recent invention. Ancient Greek νοσταλγία is unattested. It's a new Latin word that was coined from Greek roots in the 17th century. So much for an enduring concept.

Which, in French, is "citoyen" (masculine) or "citoyenne" (feminine). Not a neutral gendered word.