I have been building a social platform where people can post small apps and experiments and they run live with previews, plus remixing with lineage and attribution. It is a real secure runtime/hosting system, where your applications run in a timeline, not just screenshots and links.

I am trying to figure out what would make something like this actually sticky.

What would make you return regularly? What is missing from existing places? What would make you bounce immediately?

Say the part that is annoying but true.