There are two elements to server safety and privacy for a great VPN service:
The first is whether or not the VPN provider’s server network is safe and can’t be hacked into by criminals trying to sniff information and personal details or get info about the all round network configuration and principal server.
The second is the location of the servers. If all the servers AND the VPN provider’s location are in cooperative regions such as the United States and Europe, the safety is about as good as employing your nearby ISP. If none of the servers are in non cooperative or off shore places, then information retention laws apply to that VPN provider just as if they had been your ISP.