Well... The game is auto-saved and your save data is stored locally on your device. Like all games. And it's been fine like that for 5 years running.
Cloud-save is an add-on feature that's nice. But not needed to play the game.
Cloud-save is literally "Pokemon Bank" though, or PlayStation Plus. It MUST requires a membership because storing players' data in our storage did cost us money.
However, our support is always free~ You can always send an email to erocondo.project@gmail.com - We have many ways to transfer/recover your save data in case you ran into troubles. 😉*wink wink*