The problem will remain the same with the sport section. The user can send the deposit amount with minimal fee, gets the funds credited into his account, place a sport bet then wait the result while the transaction still stuck in the network. If the bet wins, he can later increase the fee to finish the deposit process, and if the bet loses he can simply double spend the deposit transaction and get his money back. I think this is not a wise feature from any casino, and can be considered as a loophole in the system.
Regardless of the dangers, some casinos had a 0-confirmation deposit system. Even if there are a few cheaters, they would be removed from the site the first time they try something like that.
Regarding bumping the fee of bitcoin transactions. If you use RBF to increase the fee, you are creating a replacement transaction with a new transaction ID. The original transaction with the old transaction ID becomes invalid and non-existent. That would also invalidate whatever amount you won. You wouldn't be able to withdraw it because the system would consider that the initial deposit was never confirmed and never credited to your account. At last that's how I believe it is.
Is this 0 confirmation requirements is truly possible now because even on Sportsbet back then they already removed it later on when I remember correctly.
I don't play there anymore, so I don't know. I did ask their AI support agent, and it claims that the site still supports 0-confirmation Bitcoin transactions.
A couple of questions for you, if you don't mind;
1.) If you deposit with a new casino and it takes a longer than your preferred casino, is that enough to put you off playing with them again? Or are there other factors you take into consideration?
If the deposit takes too long to be credited to my account and I miss the opportunity to submit my last-minute bet, I would probably go elsewhere the next time I want to gamble. Something even worse than that is if the casino causes issues with withdrawals and/or charges an unreasonable fee.
2.) Are you a welcome offer and bonuses player or do you prefer not to take bonuses and get in and out with fast gameplay?
I don't claim welcome bonuses because of the wagering requirements and other terms connected to them.
Re: Licence and regulation. We're governed by the laws of Costa Rica, when you setup a company in this jurisdiction they allow you to operate an online gambling business. Unlike more commonly know jurisdictions they don't have a seal of a approval. Is this important to you when choosing a new casino? "
It's not a deal-breaker if I feel the site acts honestly. A license does not equal trust and vice versa but it can be. I am sure there are players who would feel more comfortable with seeing a seal of authentication, though.