Humans are just as good as bots in generating rubbish content, if not more so.
Twitter reduced content production cost significantly, AI can take it another step down.
At minimum, a social network where people share good prompt engineering techniques will be valuable to people who are on the hunt for prompts. Just like the Midjourney website, except creating a high quality image is no longer a trip to the beach, but a thought experiment. This will also significantly cut down the cold start friction and in combination with some free credits, people may have more reasons to stay, as the current chat based business model may reach it's limit for revenue generation and retention, as it's just single player mode.