Is VPN safe when trying to withdraw bonus winnings?

It's better not to use the VPN while withdrawing or playing because they might cancel the winnings and uphold it. There are casino sites which is VPN friendly.

A VPN is never a good idea to use while playing on online casino games heck actually anything to do with banks VPN is a no go. I am in IT in South Africa and one of my clients got locked out of his bank account, they saw it as suspicious Internet behaviour and for safety blocked his account and started investigating. Took him a whole month to get access back to his account. 

Short answer from what I read in the terms: no, is not safe. Almost every casino puts VPN usage in the restricted section, and the moment you ask for a withdrawal the KYC starts. They check documents, IP history and payment method, and if the IP does not match the country of your documents they can void the winnings, not only the bonus. Some houses say it clear on the details page, Gamble Gorilla and Andromedasino write no VPN allowed, and others like CaratCasino say VPN is accepted. So read the casino details before you deposit, not after you win. Another point, even when the casino allows VPN, the payment provider can block a transaction coming from a country they dont serve, and you get stuck in the middle with the money there. My advice is simple: play only where your real country is accepted and keep everything matching, IP, documents and payment method. Is not worth risking the whole balance to save one bonus my man!