I was actually thinking of doing something like r/place but with some personal touches, some other ideas I have are:
A social helping network for developers, like a live code reviewer to learn how to implement paradigms, clean code, architectures, etc.
A collaborative platform/drawing/race game where a team draws a path to the finish line (upwards) and the other team (or maybe the spectators) draw obstacles to stop the "runner" to get to the end in time.
A trading/betting app idk.
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