Am I missing something? What rule are those sites breaking? They are clearly a scam. If you sign up and play by their rules and give them your money than it's your fault.
For example, if an item worth $1,000 sells at a final price
of $60, and a bid costing $1 raises the price of the item
by $0.01, the auctioneer receives $6,000 for the 6,000 bids
and $60 as the final price, a total of $6,060. This
represents a profit of $5,060 for the auction site.
Assuming the winning bidder used 150 bids in the process,
they would have paid $150 for the bids and $60 for the
final price, a total of $210 and a savings of $790.
And that would be fraud. (Also, an example of shocking greed, considering that the normal penny auction format is effectively a license to print money.)
"You understand and consent that you will be bidding against our robots, whose sole job is to take your money and waste your time."