> how much is known about Quark and QBox?

https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=5317&forum=3&start=15
https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=7405&forum=3&start=5

And 2 infamous threads on the topic which several MorphOS Team members took part in:

https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=6248&forum=3
https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=6319&forum=12