I believe that would bring some more juice to your experiment.
Why would he invest 4% in Freebitco.in when platforms like Nexo, Bitrue, Blockfi etc pay 8-10% APR?
In any case, OP should split his investment across multiple platforms and different avenues, not just casinos, since it's always a good idea to diversify.
While 4% is a decent yield in most cases, investing in a faceless company with no accountability is rarely a good idea in the long run.