There ar so many free VPN you can use to get things done on any site that needed the use to prevent your IP address from getting leaked to the casino you are trying to use. Using paid VPN can be good and serves well but I know if some good one like Orbot and the rest that has good connections and do not slow down your Internet connectivity. For those that are gambling on restricted regional casinos, it is good we use string VPN so our IP address does not get leaked to the casino team or support.
Are you sure orbot doesn’t slow down the network? I know I have downloaded it on my device when I wanted to access tor on mobile phone but I didn’t use it for VPN purposes though.