No. AskMagnus provides the marketplace. Your buy and sell orders are matched with orders from other users.
AskMagnus does not set the outcome prices. Prices move through supply and demand in the order book.
AskMagnus currently charges:
Before resolution, you can try to sell your position to another trader. A sale depends on available liquidity and is not guaranteed.
In short: AskMagnus operates the platform, but it is not the counterparty taking the opposite side of every trade.