THNDR Games used to be good but since they changed the payouts to be like every 1-2 hours (resulting in very small prizes per draw) instead of 24 or whatever it was before, the payouts don't make much sense unless you were going to spend your time on playing random mobile games anyway. There are also a bunch of loyalty / affiliate programs you can advertise to earn some sats. Profitability depends on whether you have some sort of an audience and whether their interests/values align with whoever you're trying to promote. Shameless self-plug: Satosh.ee has a loyalty program where you can earn points that can be exchanged for sats -up to: 1% of gift cards, 2% on discount codes and 21% on membership sales. Currently invitations are either via email or by gifting Satoshee gift cards. Referral URL's coming soon. Quick introduction to Satosh.ee: #784376