> They also buried a call home into the VBox Guest Extensions
This is incorrect and actively misleading, because you are conflating 2 different things.
The Virtualbox Guest Additions are 100% FOSS and are included in many distros, including Ubuntu -- `apt install -y virtualbox-guest-x11` -- as well as being an optional extra with VirtualBox itself as an ISO file.
E.g. https://download.virtualbox.org/virtualbox/7.0.8/VBoxGuestAd...
The Virtualbox Extension Pack is a proprietary optional extra.
https://download.virtualbox.org/virtualbox/7.0.8/Oracle_VM_V...
There is no such thing as the "Guest Extensions".