I have seen in freebitco that they still have their regular betting lines regarding price prediction of btc, eth & fun token.
So maybe, this kind of betting doesn't attract anymore in some gambling sites, but I believe freebitco is still gaining a lot of bettors on this aspect.
I also believe, it is how the platform presents their betting lines here or promotional incentives offered to their players to sustain their interest.
They need to add other games or features aside from the prediction betting lines, because gamblers need to see or play other games while waiting for their results.