Regarding the DBZ and Mario PS2 games, they are not homebrews. And I want to be clear for any instance of a licensed property getting a romhack or a fan-game, those are not homebrews either. Homebrew can only be used on "game data" (aka items in digital categories) or OC. Fan-games that use existing IP are not homebrews, so they should be set to unofficial release.
And the DBZ and Mario PS2 games should only have entry if there is a physical release. It doesn't matter if they are bootlegs or not, bootlegs exist in many game categories. We are not one of those sites that forbids bootlegs. Now if there is no actual pressed version of those PS2 games, then they cannot be added. So if they only exist as ISO and not pressed, so they can be burned and played on hacked system, or using emulator, we do not yet track that type of thing. We want to be able to do it eventually, but we have to figure out how to be able to actually make entries for games and attach them to the existing entries for physical items. When we can do that, they we can have support for console-based ROMs that were not released on physical media, official or otherwise.
Regarding the Driven to Desctruction game, we are allowing the entry until it is proven that it doesn't exist, which may require contacting the game's original publisher.