^ I confirmed because I was there before when I was participating in the Wolfbet signature campaign, they had a 7-day streak reward, come back each day and you will receive 0.00000090 BTC. And another more is the free coins from the rain chat every 20 minutes if you are active there, you will get a prize reward from rainbot. You can check it here OP if you want to know their faucets or free promotion. https://wolf.bet/promotions.
Nevertheless, I appreciated this thread of yours OP, it is quite interesting if someone looking at gambling sites that have a free reward for testing the site.