Best way would be to write a plugin that listens for the hook action:user.create. This hook receives the userData and is fired whenever a new user is created.
@eveh Make sure the spiders pseudo-group is grant permission to view topics... otherwise NodeBB hides them. spiders are not treated the same as registered-users or guests
@julian If i hide the posts and set to view only for logged in users then it effects for SEO? I need to index all contents in google. If i hide post for only logged in users, Google crawl also can't detect posts right?
That's pretty much how all the old-school BBS's ran back in the day. I was running WWiV on C++ doing my own mods and compiles in the middle of the night after everyone logged in for their daily turns on the games.
The way information is now it's so much more accessible... almost dirty.