You may have your own VPN servers that you operate yourself, or ones that are provided by your workplace or even a different VPN provider. You can import any OpenVPN or WireGuard VPN config into Windscribe, and use it as if it's a Windscribe location.
You still get all the benefits and features of Windscribe. You don't even have to have a Windscribe account! Simply choose "Config only" mode from the splash screen, and use Windscribe as a VPN utility.