@AgentRedStar AC scratches on the JP version do get revived. Some revivals include new 'recolors', some are revived 'only' through recolors. (So not the original stuff.) A revival done through their original collaboration/theme. Revivals returning through a "Lucky Bag G" themed event. But the majority gets revived through new unrelated scratches.
A couple examples:
NieR: Automata (Revived through its original collaboration/theme.)
3 years later: http://www.bumped.org/psublog/pso2-jp-ac-scratch-automata-revival/
Hatsune Miku (Revival done through a new collaboration.)
A year later: http://www.bumped.org/psublog/pso2-jp-ac-scratch-electronic-diva/
Anniversaries, special dates or occasions. (Revival done through Lucky Bag G.)
Random (Revival done through a new in most cases unrelated scratch.) [Scroll down the page till you see "AC Scratch Revivals". This is the most common way of reviving them.]
Will this also be the case for the NA version? I sadly can't tell you.