Alternative bridges' fees are actually down but the environment changed due to SWAP.HIVE being overprinted and therefore significantly less valued than HIVE (in the context of 0.9925 HIVE being the floor price). We are probably talking months here. As a result, selling HIVE to BeeSwap/uSwap/kSwap gets you more SWAP.HIVE than the amount of HIVE deposited.
If you pretend for the moment that 1 SWAP.HIVE has a fixed price of 0.9962 HIVE (or 0.9965 or whatever the bridge you are looking at thinks atm), it all makes sense. You can trade it back and forth at the slightly skewed rate and you pay around 0.1% on both sides (usu less).
LeoDex operates on under 200 HIVE liquidity these days. They are not a major bridge any longer.