Also what is like irc now.
Nostr-as-microblogging is like farcaster, is like twitter, is like Bluesky is like etc etc etc. not much novelty aspect to that, not a very 'shareable down the pub' conversation point here
Discussion
Bitchat (afaik) has no marketing beyond jack's tweets (you could pretty much say the same for nostrmicroblogs). But it is probably getting a lot word of mouth promotion.