Well, other than ramming through modules and the --add-opens fiasco from Java 9.
Also 3 years ago, the guy in charge of a Oracle database we had (now migrated to MSSQL) accidentally downloaded the wrong Oracle database software from their portal. It turns out Oracle just lets you download any variant in their portal and then just send you legal demands for payment when you accidentally use a higher tier than you licensed. Something they can absolutely fix themselves to prevent. Of course we told them to fuck off since we didn't use any feature specific to the other tier and deployed the correct variant.
If you download Enterprise Edition and use it to perform an upgrade from your SE2 database, then you will then be on the hook for the full $47,500/core.
There are two ways to undo this license change. a) Run "catdwgrd.sql" to get back to the SE2 release, then upgrade again with the correct license, or b) unload all of the data in the database (via exp/imp or data pump), then load it into a new database that is created with the correct license.
Staying on an EE database will certainly place you on the new pricing tier.
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".
And it's pretty wide open. They keep some things close to their vest, which is their prerogative, but even some of that stuff has been opening up over time as well.
It's not been a seamless transition, but it's not been awful either. Developers are managing.
It could have been far, far worse.