Jesus ... I just converted some Doge to USDT as a test to swap for another coin, and they took a completely undisclosed fee of $25. I had a tiny profit until then, and I'll be damned if I'd have approved the transaction if I saw that it would cost me 33% of the coins. There was some disclosure about the Txn costing 1 DOGE, but that was it.
Someone's raking in mad profits, and it's not the people trading the coins.