They have mentioned some specific times and only in those times they will contribute the 20% house edge revenue to the fund. I gave the suggestion before that why cant they make it flat and they contribute 20% for all the house edge revenue till certain date.
Fair point. I agree that those few hours won't be able to cater to everyone especially for those working or sleeping.
I suggest freebitco could create like a button where every member could donate any amount, then the total amount would be donate for this institution in a separate btc wallet address.