You can't just say that a trader will do this on other exchangers such as binance because they don't have a similar campaign like this but this campaign might only exist at the moment on probit global. The fees on this exchange can be a little higher but all the expenses will be recovered soon once you successfully win their campaign.
This only proves that you are not a daytrader/scalper. Fees, spreads, latency, liquidity is crucial for them. Pay 0.2% fee + 0.3-1% slippage for in and the same for out and your trade profit is gone. Many BTC trading pairs are free from fees on binance. Calculate exit scam risk while trading on unreputable exchange and this campaign is really not worth the try. No matter how much they pay.
will be recovered soon once you successfully win their campaign.
Few will win, all will pay.