Yes, European casinos that do not require a player account are entirely legal and in accordance with local gaming regulations. But, as with any other industry, there may be fraudulent websites attempting to defraud you. These may be recognized by recognizing the characteristics of a genuine no-deposit casino. Look for European licenses, such as Malta or Sweden, which are based in countries where gambling is legal. The arrangement is only permissible because it has been legalized by these Gambling Commissions, who have jurisdiction over all of Europe. You can also check to see whether the casino's website prominently displays its affiliate logos. These include Trustly and BankID, among others. When you visit these casinos, you'll be asked to log in using your BankID. The actual BankID site will redirect you to a legitimate site.