We both know that. But someone totally new won't know that. They probably won't even know how easy it is. They may just want the private messaging app, not joining a whole new microblogging platform. It seems to make total sense to give out all options for this sort of company update/troubleshooting thing. Whatever people are already on. Twitter, nostr, Bluesky, whatever.
No need to add a another step.
And let the app speak for itself as a longer term advert for Nostr. It could bring in more people if it did have mass appeal.
I don't know. ¯\_(ツ)_/¯