Some influencers, creators, artists copy their tweets over word for word with direct links to their content and expect it to work. But this is a poor way to promote on nostr. They treat it as a backup, an afterthought and expect engagement.
There are no rules on what you share but people will respond very different if you’re active and a genuine person who talks to people, rather than simply using them to get eyeballs on your stuff.
It’s not a nostr rule, it’s the basis of any relationship building.