I do not know if Opera provides unique IP for their free VPN, doubt they would be able to afford such a huge delay, but at the end o the day it never really brought me any trouble. Doesn't mean that I would suggest it, I do not want to take any responsibilities for anyone to use it and then face any trouble and blame me, I am just saying that it is fine for me and I will keep using it until I face any trouble. Even though I have all games open on regular, vpn makes me feel safer.
I guess most VPN services, including Opera, provide only a few free IP addresses. It means that there is a possibility that many users use the same IP address at the same time. This shouldn't be a problem if you just need to get access to a blocked gambling site. However, there is still a risk that casinos may restrict participation in any promotion if they detect that two or more players use the same IP address.
Does the BetFury allows users to use VPN, wouldn't that be a big risk that they get advantage to them? If a user wanted to use a VPN it is better that they invest on it I think it is not safe to use free VPN. With just $5-$6 you can have a good VPN already.