We have different point of view, I say it is not completely free because players need to risk their money. In my opinion a "complete free" is something that I can get without risking something especially money.
Exactly, even if we manage to make a wager it doesn't necessarily get a reward because it takes extra luck there, first we need luck when playing then we need luck again when predicting
To get 1 prediction ticket we need to wager around $250/ 5mbtc a little more friendly than other sites where we need to wager $ 1000 to get 1 ticket