geocities style site with AI. A website that gives everyone a blank page. Then the user can interact with an LLM/AI to build out the page. User1 might add a feed of X/Y/Z related tweets/bsky posts. User2 might have a section on their page for motivational quotes, a todo section and top news in the UK. User3 might have a different rock song everyday etc.

I thought of this earlier today and wasn't going to make it but now that I've typed it out it is tempting.

pages.ai is available (... for €95,840!)