Well, before a gambler decides to use VPN to bypass the restrictions of casinos in their country, they should also be willing to accept any consequence that is attached to their actions. Even they should to play smart by carry out such activities, I don't expect the player to put in a huge amount of money but greed will not allow some people to only use small amount.
That's true, but let's not forget that online casinos abuse this and steal from people who use VPN.
In a normal situation, when a person deals with a legit company, breaking a rule results in the loss of any profit and account closure, but should not result in the business taking all your money.
A legit casino should always return the deposit, or what's left of it and ban the client, but many casinos steal deposits claiming that after the user was discovered breaking the ToS, they don't want anything to do with him.
Imagine that you take a car to a dealership and they find that you tried to fix it on your own, or installed some OEM parts and they take these parts away for breaking the ToS, or they take your whole car and leave you with nothing.
Don't break the ToS people, but also be aware that if you do, you may get scammed by the casino.