MapHub's UI has remained largely consistent since I launched it eight years ago, with a prominent "Save" button visible in the top-right corner of the map. It turns orange when a save is needed.
For years, everyone understood they had to click the "Save" button to preserve their changes. However, recently, I've been receiving more and more support requests along the lines of: "I lost all my work" or "I've been working on a map for days, and now I can't find it."
I explained to everyone that there's no need to worry; even if they accidentally edit or delete their maps, they can always recover previous versions or even their deleted maps by clicking on the "Version History" or "Restore Deleted Maps" buttons.
But more and more users were telling me they couldn't find anything. That's when I realized that many users today simply aren't used to saving files manually.