Why do games ban VPN?

Why do games often ban the use of VPNs? Could it be related to maintaining a fair and balanced gaming environment, or perhaps to prevent players from exploiting regional pricing differences? Is there a security concern, as VPNs can sometimes mask a user's true location and identity? And how do game developers enforce these bans, especially in a digital world where users can easily circumvent restrictions? It's an interesting question that raises a lot of debate and discussion in the gaming community.