Things always move fast in the beginning, there is hype, enthusiasm, and exploring new ideas, but it is the slow grind to product market fit that makes things more than just a GitHub page

Having a good idea, doesn't always translate into a disruption that can break a worldwide network effect IE email or centralised oAuth. But based on what i've seen so far something like nsec bunker could be an option, if all clients adopt it and add it to onboarding or account management, then it helps bring in users, and they now have a nostr connected account

As for services like Substack, why wouldn't they just kick off "problematic creators" and move on, those creators can move to a more anti-fragile service like nostr, while Substack continues on.