Also one of the concern of free VPN is the potential to share IP with other casino players that violates terms. You might get connected and freeze your account even though you are not with them. Premium VPN is a must.
This should be most important for players who use free VPNs, maybe they are not cheating but the IP is the same as other players who are cheating so that it affects our accounts, unfortunately players often don't realize this, and because they are reluctant to spend money on premium VPNs they end up with things that are detrimental to him, so if you really like to gamble VPN should be included in the equipment for gambling.
When using a free VPN, which like you both have confirmed that the IP address associated with that free VPN may likely be shared with other people using the same free VPN, i dont the other players have to necessarily cheat before the casino blocks you, there are other reasons the casino might block you, and one of those is multi accounting, since several other people are using the same VPN as you, the casino would not be wrong to assume that you are operating multiple account with them, this is if the other users of that same VPN are also using the same casino as you though, aside this, i do not think there can be any harm in using free VPN, though the risk is on the high side, like for example, someone using the same IP address as you from a free VPN might wake up one day and decide to sign up on the same casino you have been playing on, then the assume will automatically assume its you who signed up another account, and both you and the person or persons will be blocked.
So overall, every serious gambler should avoid free VPN, its free quite alright, but its not always worth the stress it puts one through when trouble comes.