That VirtualBox extension pack? That aint free... well, it is for personal use only because they're not shaking individuals down. However, Oracle watches what domains download that extension pack, and sues companies when too many employees download it.

You can see that in this reddit thread: https://www.reddit.com/r/sysadmin/comments/d1ttzp/oracle_is_...

And this article also addresses the risks of dealing with Horracle.

And a company I worked for had dealings with them as well. Again, Horracle played dirty and did bullshit, except over Horracle DB itself.