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Well usually casinos offers instant deposits and you can start playing right away.They only want a few confirmations before withdrawing and this amount is usually 3 confirmations.In case you win you just wait for the 3 confirmations and then can withdraw instantly.
As far as I know, in order for you to get and be able to "use" your withdrawals, you will be needing more than 3 confirmations from the blockchain of bitcoin. As I understand it, it is different from instant deposits in which most of the time 1,2, or 3 confirmations are enough to have the deposits credited to your casino wallet.
^ As I remember correctly because I don't have enough knowledge on technical stuff on BTC transactions. The 3 confirmations consider as safe and can not be reversed but this is only for small transactions like $1k below. However, in large transactions like millions of dollars in BTC amount will need six confirmation, this is the standard for most transactions to be considered secure. It would be love to use a gambling site that offer for free withdrawal fee and I hope all of them are generous enough to have that free fees upon withdrawal.
Free fees withdrawals are getting less likely over time, because of the rise in btc transaction fees. I you have a look at the fees right now it is fully understandable that these instituations are not offering any free withdrawal, because it is just too expensive for them.
That would surely be adding up into their expense if they do tend to make some free withdrawals.For some altcoins then its considerable because of less or cheap fees but for bitcoin?
that would really hurt up their pockets specially if the fee is on the rooftop and no business would really be that generous on giving out free fees for a longer duration.
They might able to offer it out but for a limited time only which is understandable.For using up BTC for this current price and fee then its just normal to skip out
and find for alternative coins which is cheaper in terms of fees and with fast confirmation.