You can use Pmalek
thread for that (prices may not be updated as per this
post).It still gives you an overall idea of the fees being applied by different casinos.
Thanks for suggesting that he can use my thread as a reference.
The last time I checked all the casinos and updated the amounts in the table was between 18-21 December 2021, so it should be quite up-to-date. There have been some other minor changes to the displayed data for certain platforms as suggested by other members in the thread as well.
According to Pmalek table at least sportsbet.io and Bitcasino do not charge withdrawal fees. They may not, however, support the currencies that you're playing with so I guess you'll have to spend some time studying the available offer.
That's correct. Besides those two that you mentioned, FortuneJack, BetChain, and Winz.io also charge their customers 0 transaction fees on withdrawals.
He can always check which altcoins are supported by which platforms by looking at the last column in my thread.