@chris @Vivaldi @wordpress Regarding how they finance themselves, you can read about their business model: https://vivaldi.com/blog/vivaldi-business-model/
As for why they're not open source, you can read about that here: https://vivaldi.com/blog/technology/why-isnt-vivaldi-browser-open-source/
@atomicpoet Umm, you might want to have a look at that list again; that says NeoDB, not NodeBB.
AFAICT, NodeBB is still not being listed in the https://fedidb.org/software page.
@fediversenews