Hmm I think nostr:npub1z0lcg9p2v5nzg5fycxq0k56ze6snp42clmrafzqpn5w6u74v5x9q708ldk is more for conversations and such but also has the ability to “broadcast” which is like live-streaming without audience participation and zap.stream is a pay to use sort of streaming service. Anyone can chime in to correct me on this