As i remember, before they updated their app and remade daily rewards, there was 3-4 ads per day, but after that 1 or zero.
But 10 dias a week as daily rewards is still ok, to be honest, I left more because of useless coins and headache with non-working keys - I bought 6 lootpacks with Steam keys and 3 of them were used. One of them was replaced for me for almost two months, and I also found out that the last one was also not working when I already deleted my account and the key went to the person here as a win and ruined his joy.