Yes I also think this casino is one of the best vpn users friendly Although I don't know when or how long it will last . And yes most of the case when some players use free vpn which are not provide the best service then they face some errors. Even then it's quite vpn friendly but it can't speed up internet speed so I also think it will be a good step if build miror link taken .
You can't assume that this casino will be VPN friendly for users in restricted areas, so every casino has terms and conditions that users from restricted areas should be aware of before accessing using a VPN.
By accessing or using duelbits.com or you confirm to be not from any banned or restricted Region. You may not access the Service from a banned Region via a VPN.
You have to consider the TOS above, so mirrorlink will not be useful if it is built to solve the problem of users in restricted areas, it is the same as giving free space for VPN users to abuse the specified requirements. Imo