Do all the investors in each of groups 2, 3, and 4 get the same amount, or does the amount that they get based on how much BTC they gave vs how much is total in each group. I would assume it's based on how much they gave vs the total but I didn't see that clearly stated (or at least I missed it)
No. For 2, 3, and 4, it will be proportionally based on the btc you invested. See the OP.