Is bidding on products on the "Bidspeed" website – where bids are purchased and their money is not refunded in case of loss – considered gambling and therefore unlawful (haram)?

As long as the aforementioned website does not refund the losing bidder what they paid, it is impermissible to participate in the auction it conducts. This is because the participant either wins the auction, thus profiting by acquiring the item at a low price, or they do not win the auction and lose the money they paid. This is precisely gambling. Gambling is defined as an activity where the participant inevitably either profits if they win or loses if they do not.