Its good thing that Wolf bet use the average fee in Bitcoin because I saw many Casino that charge 0.001BTC flat rate on Bitcoin withdrawal fee no matter what is the status of mempool.
How exactly is a good thing? Wolf.bet is charging very high BTC withdrawal fee which is a negative point and there is nothing good about this. They need to learn from other sites which charge lower or zero withdrawal fees in comparison.
It is fact that you must be aware of and must accept when you use crypto exchanges and gambling sites. Some of gambling sites waive withdrawal fee but they are not too common.
If you want to get cheap withdrawal fee, choose altcoins.
You could also simply switch to other crypto gambling sites that charge lower or zero withdrawal fees like Bitcasino, Stake etc because majority of the gamblers prefer withdrawing BTC instead of other altcoins.
Why? Because it's easier to convert to their native FIAT currencies through sites like LocalBitcoins etc when compared to altcoins -> FIAT.