Didn't even reach 500 😢

I saw a past post and started this hidden quest that had ad watching and seemed to have good rewards, thinking it went up to level 500... But it ended at 50... ∑(OωO; ) There's no ad watching either. Level 5 💎2,000 Level 15 💎3,700 Level 20 💎6,000 Level 50 💎12,800 It seems like you could get rewards from level 50 before, so maybe it's easier now?