For those VPN lovers, I advise you guys don't play with big money, since even if you get an epic win, there is still some possibility they will deny your withdrawal. Nowadays, VPN is pretty much necessary, but that's the reality of the 3rd party slots, we cannot access some from our country. There's no "legal" workaround about that, so pick another provider if you want to be sure there will be no problem in the future. The good thing is, slots games are pretty much similar, so you will have the alternative title from different provider.
If a casino accepts the use of a VPN, why should it bother them if someone use it? If anyone is in doubt, anytime can just ask support and it is best to take a screenshot of the conversation in which he will receive a confirmation. If the casino is in doubt they can do KYC verification and there should be no problem to withdraw winnings.
sometimes you can't expect that it will always be the case. if the provider says no to your winnings because you are using VPN, then, you're screwed. so if the provider is not available in your country, better not play with them. this is to avoid possible freezing of your funds or of that sort. because i think that the site can't do anything about it if the provider keeps on their stand not to release the winnings.
so don't push yourself to the provider that is not available in your region. be contented on what is available. you can also check other casinos, because they are not all the same. with so many providers, i don't think you will run out of options.