Most likely, it is. There is a week left till the end of betting, but it seems to me that this month, the prize pool for BTC price prediction, as well as for ETH and FUN price predictions, will be much smaller than usual because many users don't check the betting tab every day.
Yes, the increase in the prize pool is not as fast as usual, maybe because this bet is not available at the beginning of the month so many people think it will not be available this month or as you said because not many people check the betting section every day but usually there will be a banner about price predictions on freebitcoin so that users those who play can know about the availability of this bet.