I believe other gambling sites use the automatic withdrawal option even when fees are high, and it is usually fast without having to use a third party.
But in some gambling sites, every withdrawal is free, there are things that are not the same as Fortunejack and sportsbet when making a withdrawal, so there is no need for a fee, therefore I prefer this compared to options by choosing the desired fee.
Gambling sites can waive fees for users or charge fees. It is their generosity and users can not depend on it. It is better for users and gambling sites with more options to withdraw funds at cheap fees by using some altcoins.
Users can control on the fee they want to pay with the withdrawal method they choose and get rid of dependence on generosity from gambling sites.
However, other small altcoins are still a lot of choices because of their cheap and fast fees on the network.
ETH and BTC are now widely avoided because they require huge transaction fees.
ETH with 2.0 upgrade can help transaction fee back to low levels.
Bitcoin can not be changed by protocol and I only wish that gambling sites will accept Lightning network.