Surely a player who is online 24 hours per day, seven days a week is more likely to be a bot than someone who checks in once or twice per week?
I honestly dont think that someone is dumb enough to give himself up by claiming 24 times a day with a bot. ( or do they? lol ). Back in the days I remembered that I tried to claim atleast 14 times after using the RP bonus lol and I think thats pretty much the limit even
Other idea could be to only give RP to people that are already a longtime member of the site (i.e. if you are member longer than 1 year than you will be able to get RP ...).
That would probably cut off large amount of freebitco.in players because most people probably registered after freebitco.in announced the WoF. Gotta be honest that WoF spins. Before that, I think you will need over 6 months just to get 1 mbtc from this site provided if you dont have any active referall