Kaizin Rumble Revival is an unofficial fan server. There are no ads, and
nothing is shared with anyone else except as below.
What the server keeps
Your phone's device ID, used as your guest login
Your Leader, cards and progress, your ally list, comments you send and battle results
If you make a Kaizin Rumble account: its ID and a scrambled (hashed) form of your password
A request log for fixing bugs (kept 7 days, passwords removed) and daily backups (kept 14 days)
If you buy Evil Crystals: the payment number, the pack, the amount and which Leader got it
Payments
Evil Crystal purchases are paid on the payment provider's own website (Stripe or PayPal).
Your card details are handled by the provider only; this server never sees them. The provider's own privacy
policy applies to the payment.
Removing your data
Ask whoever gave you the game to delete your Leader.