This is false. https://www.virtualbox.org/wiki/Licensing_FAQ says:
> the VirtualBox Guest Additions are licensed under the GPLv2.
You might have been thinking of the VirtualBox Extension Pack, which is an entirely different thing.
Oracle could not milk VirtualBox for money so they used this as a way to extort unknowing commercial users.
Even if it isn't reasonable to do so, I suspect most people do indeed do so, and that's exactly what Oracle is counting on.
Where in the App does it download the extensions? I know it will download the Guest Additions for you, but those are something completely different.
1: https://docs.oracle.com/en/virtualization/virtualbox/6.0/use...
When it finally came down to PCIe pass through to get better 3D support I moved to qemu/kvm, no one forced me to pirate Oracles software for that. Of course qemu/kvm can be an absolute shit show to configure, so I still default to Virtual Box.