Quote: Can I get all my lost data if I didn't register an account and just have my name on it?
Sorry, if you didn't register your account and you happen to delete the app off of your device, it's gone for good (I've had it happen to me with my first account, and when I contacted Silicon Studios' support they told me they can't retrieve accounts that weren't registered).
if i bought crowns for my account, but i didnt register my user, i lost al my data?
Quote: if i bought crowns for my account, but i didnt register my user, i lost al my data?
If it's making you start from the beginning where it asks you to create a username and you go through the tutorial (because app corrupted or you deleted it), your unregistered account is gone. Sorry to hear.
Quote: So not even using individual Google accounts that bought crowns will they at lest reimburse the crowns to the new account?
I don't believe so, as it was up to the user to register their account to prevent losing it.
Also, if they were lenient with it, players could abuse it in order to re-roll using the reimbursed Crowns.