That's unbelievable. If that's actually the case, then it calls for questioning. Why should any platform in crypto charge up to 12% as a transaction fees which is about 4x higher than what a traditional credit card payment platform could charge per transaction. Where does the charged fees go? To Ether or to SpiderDAO? I'm curious.
Can't blame the network for that. They set their gas fee higher to make their transaction to be executed faster. Its not the fault of the ethereum network. The fees goes to the miner whom process the transactions of course. Spiderdao didn't ask these users to put a higher gas. Its their decision to join since this is a gas war that happened on a typical limited slot ICO. No need for questioning because this is happening even before defi started to get hype. If you are aware of this kind of Hype then youll know that this is pretty "normal".