Winline gave away bonuses to almost 650,000 customers during the first 16 hours of their Sea of Free Bets campaign. The company started the promotion at midnight Moscow time several weeks after announcing it. Players enter a special section and find nine cards showing different sports club logos. Each card hides a free bet worth different amounts of money. Random selection determines what bonus each person receives.
Account activity appears to influence bonus amounts for different players. Light users typically receive 100 to 500 rubles through the system. Active gamblers often collect 5,000 to 10,000 rubles from their cards. The first wave encourages people to invite friends using referral links. Each successful referral earns 25...