By the way, not sure if you guys ever saw it but betfury also has this:
https://betfury.com/boxes/all0.01$ in btc every hour or so which amounts to 0.00000224 btc in "daily profit".

I found this one after using the site for months.

More guaranteed return than the free spin for sure.
It's worth noting that free boxes appeared on the Betfury website long before the wheels were added. If I'm not mistaken, there were more different crypto boxes before, and the daily profit from them was also more than it's offered now.
Unfortunately, Betfury began to emphasize the crypto boxes tab less after some users abused it.