> we failed to provide a significant customer base, so I guess he doesn't
> feel compelled to release it.

AE4 is freeware. Can there even be customers for freeware? If not so, I think this cannot be the reason for him holding back the source code, as he talked about open sourcing it only when he made it freeware, not before, obviously.

> No Audio Evolution.

Huh? See there:

https://morph.zone/modules/news/article_storyid_1792.html
https://morph.zone/modules/newbb_plus/viewtopic.php?forum=32&topic_id=7104&start=104

> No Pagestream. Anything else we didn't get?

Way too much to list it here ;-)