This is a non safe for work, as in lewd, instance.
It’s safe to assume that anything you see here will be lewd.
Just letting you know. If you view the content and then pull a surprised pikachu when you see big anime tiddies, Judy Hopps getting railed or some furry vore… Then it’s on you.
Should this popup continue to show up, you may want to enable cookies or disable privacy focused addons on your browser, I assure you we won’t track our user.
Should that fail, some users claim they got rid of it by hammering the ok button.
I just looked all this over and, just to clarify, both VirtualBox itself and the Guest Additions are free and released under GPL3.
https://www.virtualbox.org/wiki/Licensing_FAQ
What is not free is the separately downloadable “VirtualBox Extension Pack”.
As long as you stay away from the “Extension Pack”, you are ok.