i think its just so you can save you're progress. otherwise when a new chapter comes out you would have to play the game all over again. not 100% sure though.
We literaly do not have access / or use any of your data. We use an account system to be able to play on multiple devices at once, or to play on browser without the scare of all of It getting removed when you clear your cache. Feel free to ask if you have more questions!
