How the calculation works
The platform computes each player's exact equity with the cards known and the board incomplete, then pays that share of the pot. If you hold 70% equity in a pot, you receive 70% of it, less the fee, and the hand ends there for you.
Nothing about that is a prediction or an estimate — the equity figure is exact. What you are giving up is not fairness; it is the upside of the times you would have won the whole pot, in exchange for never losing it.