It links docker's network through a linux/windows pipe to a process on your windows/mac host. So containers network packets don't get out from a virtual network adapter (that can be filtered out) but from a vpnkit.exe process on windows.
Using this, you are more compliant with strict corporate security rules and are less likely to be blocked by your VPN client, proxy firewall etc...
In big Companies, the usage of VPN solution is pretty common. Especially since COVID with the rise of remote workers.
One big feature Docker Desktop nailed is the VPN friendlyest of the solution! They developped VPNKit to solve VPN issues, and honestly it works very well.
None on the alternatives provide such feature!
I propose 2 young YT channels that worth watching about reliability and observability
- Slight Reliability (https://www.youtube.com/c/SlightReliability) Podcast from Stephen TOWNSHEND
- Is it Observable (https://www.youtube.com/c/IsitObservable) from Henrik REXED