...and there goes Substack's entire business.
Overall, this is great for writers however. The missing component to Substack was the discovery/social mechanism. From a strategic perspective, it's easier to bolt on newsletter sending than it is to build a new social network.
So this was always a huge risk for Substack as a platform. But hey, there's also an alternate universe where Twitter stays dumb and lazy and never crushes Substack. So I see why investors took the risk.
But I see no path forward for Substack if Twitter manages to not completely botch this.