If we are to even consider the replies on this thread on recommendations for the platforms that accept the use of VPN, I don't think there are suggestions made and if any at all, they are not many, gambling platforms don't usually demand or take in the use of VPN for their website, but Incase we see some that allow for that, maybe they are just new in the business or doesn't have enough resources to employ for the measures that take care on that.
Aside from the regulatory reasons that make casinos to turn down VPN usage, other factors also discourage the use of VPN such as its effect on the loading speed of the site and how VPN also affect some game functionality on the casino, these things contribute to why those casinos never allow VPN in general or why gamblers do not see VPN usage as something attractive.
If not, most of the casinos are VPN-friendly and do not mind gamblers who have verified accounts using VPN to bypass any restrictions if need be at some point.