Topic on Talk:List of games that support OneDrive save game cloud syncing
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Good point. I am not sure exactly why I went for true to begin with but it might have to do with how the OneDrive functionality does not require any "hacking" on its own to enable it for a game, beyond enabling the backup of the Documents folder in OneDrive. In that regard, a true "hackable" setting would be required for games that supported changing the location of save files natively, and the user would have to manually change that to store its saves within the Documents folder.
Regardless, I've changed things around so "hackable" is now the value set and shown on game articles.