The casino does not issue the spins without a real money account, because if you do not have an account, then you cannot attach them to anything. That is, to receive the spins you need to register for an account on the site.
If you succeed to win a decent amount, you might need to pass verification. This means to download an identity document (passport, ID card, driver’s license) with a photo. Sometimes the administration requires documents proving residence: utility bills, extracts from the house book. Such a procedure is needed to confirm the identity and protect players from fraudulent actions by third parties.