I tested the same €200 deposit twice. Round one with bonus: €200 + €400 bonus, €12,000 wagering, 14-day deadline. Day 9: wagering at €7,800, balance €38. Bonus burned out, in hand €0.
Round two without bonus, just the 10% daily cashback: €200 in, played the same volume of ~€4,100 over 12 days, loss -€84, cashback accumulated to €38.70. Net -€45.30. In hand €154.70 from the original €200.
Across both rounds the 200% bonus worked only when the volume was finished on time and the swings stayed tolerable. Cashback gave less upside, but the balance curve was easier to live with.